"Taos Noise"
Have you heard the engine or drilling rig running? It is this kind of unpleasant noise that disturbs the peace of residents of the American city of Taos. An incomprehensible humming sound coming from the direction of the desert first appeared almost 18 years ago, and since then it has reappeared regularly. When city residents turned to the authorities with a request to conduct an investigation, it turned out that the noise seemed to come from the bowels of the earth, it could not be registered by location devices, and only 2% of the city population heard it. A similar phenomenon is observed in other regions of the planet. It occurs especially often in Europe. As in the case of the Taoist rumble, the reasons for its occurrence and source have not yet been discovered.
Ghostly doppelgängers
Cases when people meet their doubles are not uncommon. Stories about dopplegangers (this is to avoid writing “doubles” twice in a row) are present both in medical practice, which is not at all surprising, and in historical documents and literary works. Guy de Maupassant told his friends about meeting his double. The mathematician Descartes, the French writer George Sand, the English poets and writers Shelley, Byron, and Walter Scott also encountered their copies. We won’t even mention Dostoevsky’s story “The Double.”
However, doppelgängers also visit people of prosaic professions. Here are the stories collected by Dr. Edward Podolsky. One woman saw her double while putting on makeup in front of the mirror. A man working in the garden noticed next to him an exact copy of himself, repeating all his movements.
Scientists suggest that the secret of doppelgängers may be hidden in our brains. By processing information, our nervous system creates a so-called spatial diagram of the body, which, due to reasons unknown to science, is divided into real and astral images. Alas, this is just a hypothesis.
Life after death
A light at the end of a dark tunnel, an unusual luminous creature, a calling voice, the ghosts of deceased loved ones - this is what awaits a person in the next world, according to the words of the “resurrected”. In other words, they suffered clinical death.
One of the proofs of the reality of the afterlife was the research of William James, which he conducted with the participation of the medium Leonora Piper. For about ten years, the doctor organized spiritualistic seances, during which Leonora spoke on behalf of the Indian girl Chlorin, then Commander Vanderbilt, then Longfellow, then Johann Sebastian Bach, then the actress Siddons. The doctor invited spectators to his sessions: journalists, scientists, other mediums so that they could confirm that communication with world of the dead is actually happening.
Unfortunately, no scientific facts there is no such thing yet. However, maybe this is for the better?
Noisy Spirit
Poltergeists are an inexplicable phenomenon and at the same time a constant hero of yellow press materials. “Barabashka stole the family’s salary from Kapotnya and wrote a swear word on the wall,” “Poltergeist became the father of three children,” these and similar headlines still regularly attract an audience.
Poltergeists were first mentioned almost two thousand years ago by the historian Titus Livius, who described how someone invisible threw stones at Roman soldiers. After this, cases of poltergeist appearances were described many more times. Mentions of this phenomenon are even present in the chronicles of a French monastery. According to the chronicler, on September 16, 1612, something incredible happened in the house of the Huguenot priest François Perrault. It all started when, at midnight, the curtains began to close on their own, and someone was pulling the bed linen off the beds. A loud noise was heard in various parts at home, and in the kitchen someone was throwing dishes. The poltergeist not only methodically destroyed the house, but also cursed desperately. The Church decided that the devil had taken up residence in the house of a Huguenot sinner, and Martin Luther later proposed calling the “obscene spirit” a poltergeist. After 375 years in the USSR they will call him the drummer.
Heavenly signs
According to history, clouds are not only white-maned horses. Since time immemorial, eyewitness accounts have been preserved telling about whole pictures, meaningful signs and numbers that suddenly appeared in the sky. According to legend, one of these heavenly visions predicted victory for Julius Caesar, and another - a blood-red flag with a white cross - gave strength to the retreating Danish troops and helped them defeat the pagan Estonians.
Scientists are skeptical about such pictures in the sky and name several reasons for their appearance. Today various figures aircraft exhaust may form in the sky. After aircraft fuel burns out, water vapor enters the atmosphere and immediately turns into ice crystals. Caught up in air vortices, they behave very unpredictably and can create various shapes. Aerosols sprayed during weather experiments are based on carbon dioxide and barium salts can also cause similar phenomena. In addition, air, due to its specific properties, sometimes acquires the ability to reflect what is happening on Earth.
The phenomenon of wandering graves
In 1928, all Scottish newspapers were full of news about a grave that had disappeared from the cemetery of the small town of Glenysville. Relatives who came to visit the deceased found an empty space instead of a stone tombstone. It was never possible to find the grave.
In 1989, on a Kansas farm, a grave mound with a lopsided and cracked headstone appeared overnight right in the middle of a barnyard. Because of poor condition It was impossible to read the name on the plate. But when the grave was excavated, a coffin with human remains was found in it.
All this devilry is considered commonplace in some African and Polynesian tribes. There is a tradition there of dousing a fresh grave with tree sap and covering it with shells. This is done, according to the priests, so that the grave “does not leave.”
Pyrokinesis
Cases where people engulfed in flames of unknown origin turned into a handful of ashes in just a few minutes have been known for a very long time. Although this phenomenon occurs infrequently: over the entire last century Only 19 cases of pyrokinesis have been recorded in the world. Scientists cannot explain why this happens, and most importantly, why the flame often does not spread to surrounding objects.
In 1969, a man was found dead in his car. His face and hands were burned, but for some reason the fire did not touch his hair and eyebrows. A completely fantastic incident occurred in the Canadian province of Alberta. The two sisters burst into flames at the same moment, being in different parts cities, at a distance of a kilometer from each other.
Versions of the origin of pyrokinesis are increasingly fantastic. Some doctors are trying to link spontaneous combustion in people with their internal state, since it is known that most of the victims were depressed for a long time. Others believe that it is mainly alcoholics who are affected by pyrokinesis. Their body is so saturated with alcohol that it can burst into flames at the slightest spark, especially if the deceased smoked. There is a version that the flame arises under the influence of either ball lightning that happens to be nearby, or energy beams unknown to science. And recently a completely incredible theory was put forward. Allegedly, the source of energy in a living cell is a thermonuclear reaction, that is, under the influence of an unknown force, inexplicable energy processes begin to occur in the cell, similar to those that occur during the explosion of an atomic bomb.
You will find more secrets and mysteries in the documentary series Fact or Fiction: Paranormal Activity on the Syfy Universal channel. New episodes every Monday at 21.00.
On our planet, along with modern, technologically and industrially developed megacities, there are many places created by ancient masters or nature itself.
Each such attraction has its own legend and, naturally, is silent about a lot of things. Mysterious places call great amount questions among scientists, they are confused by anomalous phenomena and the unknown.
1. Devils Tower, USA
The so-called Devil's Tower is actually an amazing natural rock correct form and consists of columns with sharp corners. This is true mysterious place, which, according to research, is more than 200 million years old, is located in the USA, in the territory of the modern state of Wyoming. 
In size, the Devil's Tower is several times larger than the Cheops Pyramid and from the outside resembles a man-made structure. Thanks to its unrealistic size and unnaturally correct configuration, the rock has become the object of attention of many scientists, and local residents they claim that Satan himself built it.
2. Cahokia Mounds, USA
Cahokia or Cahokia is an abandoned Indian city, the ruins of which are located near Illinois, USA. This place is reminiscent of how ancient civilizations lived, and its complex structure proves that this area was inhabited by a highly developed people 1500 years ago. The ancient city is striking in its scale; a network of terraces and 30-meter earthen mounds, as well as a huge solar calendar, have been preserved on its territory. 
It is still unknown why a society of almost 40 thousand people left their settlement, and which Indian tribes are direct descendants of the Cahokians. Despite this, the Cahokia mounds are a favorite place for many tourists who come here in the hope of unraveling the mystery of the ancient city.
3. Chawinda, Mexico
This mystical place, according to the beliefs of the aborigines, is the center of intersection of the real and other worlds. That is why incredible things happen here that are difficult for modern people to understand. 
Chawinda is of interest to many treasure hunters, because according to legend, this area hides unprecedented wealth. Unfortunately, no one has yet managed to find the treasure. Would-be treasure hunters often attribute their failures to otherworldly forces.
4. Newgrange, Ireland
Newgrange is the oldest building on the territory of modern Ireland, it is already about 5 thousand years old. It is believed that this long corridor with a transverse room is a grave, but for whom, scientists have not yet been able to determine. 
It is still unknown how ancient people were able to build such a perfect structure, which for five thousand years was not only lucky enough to survive, maintaining its primitive appearance, but also to remain completely waterproof.
5. Pyramids of Yonaguni, Japan
Mysterious underwater pyramids near the western Japanese island of Yonaguni are causing a lot of controversy among modern archaeologists and surveyors. Main question– are the structures a natural phenomenon, or were they created by hand? ancient man. 
In the course of numerous studies, it was possible to establish that the age of the Yonaguni pyramids is more than 10 thousand years. Therefore, if the Yonagun monuments created mysterious civilizations unknown to us, then the history of mankind should be rewritten.
Mysterious civilization. Underwater cities of Yonaguni
6. Geoglyphs of Nazca, Peru
The Nazca geoglyphs in Peru are one of the most mysterious places on the planet. They were discovered in the middle of the last century and are still actively discussed by scientists who cannot say unambiguously what the ancient people wanted to express with these giant drawings of animals and for what purpose were they used? 
Unfortunately, it is no longer possible to ask the creators, but scientists offer 2 main versions: some, leaning towards the cosmic theory of the origin of geoglyphs, believe that they are landmarks for alien ships, others claim that they are giant lunar calendars. In any case, the Nazca rock paintings are proof of the existence on the territory of modern Peru of an ancient and mysterious civilization that lived here long before the famous Incas and was distinguished high level development.
7. Black Bamboo Hollow, China
Black Bamboo Hollow or Heizhu is perhaps the most terrible place on Earth. Local residents have nicknamed it the Valley of Death, and they do not even want to get close to it at any cost. Just the memory of the ravine fills them with great horror. 
They say that children and pets disappear here without a trace, and there is a lot of documentary evidence of this. Scientists have been interested in the hollow of black bamboo for decades; they have been able to prove that the valley in the Chinese province of Sichuan is an anomalous area with a harsh climate and sharply changing weather conditions, which together provokes soil subsidence, which, according to scientists, is the reason for the loss of people.
8. Giant's Causeway, Ireland
The Giant's Causeway, or Giant's Causeway in Northern Ireland is an amazing coastal area formed many centuries ago as a result of a volcanic eruption. It consists of approximately 40 thousand basalt columns that look like giant steps. 
The natural attraction is one of the UNESCO World Heritage Sites. This place deserves admiration, which is why more than one thousand tourists from all over the world visit it every year.
9. Goseck Circle, Germany
The Goseck Circle is an ancient Neolithic structure in the German district of Burgenlandkreis. The circle was accidentally discovered in the early 90s of the last century while surveying the area from an airplane. 
The original appearance of the building was restored only after complete reconstruction. Scientists have little doubt that the Goseck Circle was used for astronomical observations and calendaring. This proves that our ancestors also studied cosmic bodies, their movements and kept track of time.
10. Moai monuments on Easter Island
Easter Island is famous throughout the world for the giant Moai statues located throughout its territory. Each such megalithic figure is a large monument created by the masters of an ancient civilization in the crater of the local volcano Rano Raraku. 
In total, about 1,000 remains of such man-made monuments were discovered on the island. Most have already gone under water.
Today, the vast majority of the statues are once again placed on platforms facing the ocean, from where they continue to greet visitors to the island and remind them of their former power ancient people who inhabited these spaces.
Easter Island - Moai Message
11. Georgia Tablets, USA
The Georgia Tablets are 20-ton polished granite slabs with inscriptions in eight of the world's most famous languages. The inscriptions represent commandments for future generations on how to rebuild civilization after a global cataclysm. The monument was erected in 1979, the customer is listed in the documents under the name Robert C. Christian. 
The height of the monumental structure is just over six meters, and the slabs are oriented towards the four sides of the world and have holes. In one of them you can see the North Star at any time of the year, in the second - the Sun during the solstice and equinox. Several years ago, the monument was vandalized and was damaged by paint, which has not yet been removed.
12. Rishat (Eye of the Sahara). Mauritania
On the territory of modern Mauritania, the largest desert in the world hides an amazing natural phenomenon of the Proterozoic period, whose name is Richat or the Eye of the Sahara. 
This object is incredibly huge (up to 50 kilometers in diameter), so it can be seen even from space. The structure consists of several ellipsoidal rings formed by sedimentary rocks and sandstones about 500 million years ago.
13. “Gateway to Hell” – Darvaza crater in Turkmenistan
The Darvaza gas crater is located in the Turkmen Karakum desert, appearance resembling a gate to hell. This fire pit, about 60 meters in diameter and up to 20 meters deep, is the result of excavations carried out here during the Soviet Union. 
During such geological research, a group of scientists discovered an underground cavern with natural gas, which almost led to the death of a huge number of people. Therefore, the management decided to set fire to the gas so that it would not threaten local residents. But the fire, which was supposed to burn for no more than 5 days, is still burning, bringing fear to everyone who approaches it.
Brave people are ready to take selfies at the Gates of Hell
14. Arkaim, Russia
Arkaim is an ancient settlement, reminiscent of ancient civilizations, which was discovered several decades ago in the vicinity of Chelyabinsk. It is believed that this landmark of Russia is the birthplace of the ancient Aryans, who gave rise to European, Persian and Indian civilizations. 
Arkaim is not only a unique architectural monument with a thousand-year history, but also a place of concentration of healing energy flows that can save a person from any disease.
15. Stonehenge, England
English Stonehenge is a real place of pilgrimage for tourists from all over the world. It attracts with its mystery, legends and mystical beginnings. Stonehenge is a megalithic structure up to one hundred meters in diameter, which is located on Salisbury Plain.Supernatural and paranormal phenomena appear from time to time in the life of every person. Moreover, they disturbed the ancient minds, causing fear and misunderstanding. Previously, people saw such miracles clean water mysticism and even witchcraft.
Modern science puts phenomena that are inexplicable at first glance on the shelves of ordinary physical laws and chemical reactions.
But share unsolved mysteries remains more than significant. The most interesting facts about the supernatural and paranormal are in this article.
1. A mysterious phenomenon systematically occurs on the coast of the island of Crete. Near the ancient castle of Franca Castello, the events of the battle between the Turks and Greeks are played out in front of tourists. And they appear in the form of... a mirage. A cloud of smoke or millions of droplets of moisture with a barely perceptible ringing of weapons and the screams of soldiers moves from the embankment, and disappears near the walls of the castle. No one can explain the nature of such a phenomenon with scientific point vision.
2. An unusual photograph of Mount Ararat was taken by American pilots in 1949. In addition to picturesque rocky ledges and a snow cap, they captured a strange object above the abyss. According to numerous studies carried out from satellites and aircraft, some scientists suggest that this is the mythical Noah's Ark. There is no single reliable opinion about the mysterious object on Mount Ararat.
3. Deja vu is familiar to every person. But in most cases we cannot explain the nature of this feeling. The phenomenon was studied in more detail by psychologist C. G. Jung. At the age of 12, he saw an ancient figurine of a doctor from the 18th century and the boy was impressed by the buckles on the doctor’s shoes. C. G. Jung was sure that once (perhaps in past life) wore shoes with the same buckles. He was never able to logically explain his déjà vu.
4. Did you know that Abraham Lincoln had a vision of his own death? This happened 10 days before the tragic incident. At night, the president heard sobs from the lower floor of the house. He went down and found a body there. When asked who died, the answer was: “The President. He fell by the hand of an assassin."
5. B Atlantic Ocean between the Falkland Islands and South Georgia theoretically contains the Aurora Islands. Theoretically, because they were seen and accurately mapped in the 18th century by the captain of the ship Atrevida. Half a century later, the islands disappeared without a trace.
6. Interesting Facts about the supernatural also concern natural phenomena. Many of them defy scientific explanation. You just need to believe in such miracles. For example, in the Shaanxi province of China there is a waterfall whose waters do not freeze even in severe winter. But in summer the flow can completely freeze in the air for some time.
7. In the Jatinga Valley (in Assam, India), an anomalous phenomenon occurs every year in August. Here every night a huge number of birds fall to the ground. It is not known what is happening and what is affecting the birds. This place has already been dubbed the “Valley of Falling Birds.”
8. Not long ago, scientists discovered similarities between the sizes and contours of Antarctica and the Arctic Ocean. The explanation for such an anomaly is no less supernatural. It is believed that a large meteorite squeezed out part of the continent (Antarctica) from opposite side Earth.
9. There are plants on our planet that are more than 150 million years old. It's about about the Vulemi pines, the existence of which remained a secret until recently.
10. Do you know that the place on earth where lightning struck is called “thunder baldness”? In addition, for some time (a couple of minutes) it remains dangerous for all living beings who set foot on the territory of the bald spot. It turns out that lightning did not touch, for example, a person at all, but he could still get hurt. Scientists cannot explain this phenomenon.
Scientists have classified the most unusual and mysterious phenomena on Earth. What our ancestors once called “devilry”, modern scientists classify as the realm of the unknown. However, they cannot yet explain the reason for this most unknown thing.
"Taos Noise"
Have you heard the engine or drilling rig running? It is this kind of unpleasant noise that disturbs the peace of residents of the American city of Taos. An incomprehensible, mysterious humming sound coming from the desert first appeared almost 18 years ago, and since then it has reappeared regularly. When city residents turned to the authorities with a request to conduct an investigation, it turned out that the noise seemed to come from the bowels of the earth, location devices could not register it, and only 2% of the city population heard it. A similar phenomenon is observed in other regions of the planet. It occurs especially often in Europe. As in the case of the Taoist rumble, the reasons for its occurrence and source have not yet been discovered.
Ghostly doppelgängers
Unusual cases where people meet their doubles are not uncommon. Stories about dopplegangers (this is to avoid writing “doubles” twice in a row) are present both in medical practice (which is not at all surprising) and in historical documents and literary works. Guy de Maupassant told his friends about meeting his double. The mathematician Descartes, the French writer George Sand, the English poets and writers Shelley, Byron, and Walter Scott also encountered their copies. We won’t even mention Dostoevsky’s story “The Double.”
However, doppelgängers also visit people of prosaic professions. Here are the stories collected by Dr. Edward Podolsky. One woman saw her double while putting on makeup in front of the mirror. A man working in the garden noticed next to him an exact copy of himself, repeating all his movements.
Scientists suggest that the secret of mysterious doppelgängers may be hidden in the brain. By processing information, our nervous system creates a so-called spatial diagram of the body, which, for reasons unknown to science, is divided into real and astral images. Alas, this is just a hypothesis.
Life after death
A light at the end of a dark tunnel, an unusual luminous creature, a calling voice, the ghosts of deceased loved ones - this is what awaits a person in the next world, according to the “resurrected”. In other words, people who have experienced clinical death.
One of the proofs of the reality of the afterlife was the research of William James, which he conducted with the participation of the medium Leonora Piper. For about ten years, the doctor organized spiritualistic seances, during which Leonora spoke on behalf of the Indian girl Chlorin, then Commander Vanderbilt, then Longfellow, then Johann Sebastian Bach, then the actress Sidsons. The doctor invited spectators to his sessions: journalists, scientists, and other mediums so that they could confirm that communication with the world of the dead actually occurs.
Unfortunately, there are no scientific facts on this matter yet. However, maybe this is for the better?
Noisy Spirit
Poltergeists are an inexplicable mysterious phenomenon and at the same time a constant hero of yellow press materials. “Barabashka stole the family’s salary from Kapotnya and wrote a swear word on the wall,” “Poltergeist became the father of three children,” these and similar headlines still regularly attract an audience.
Poltergeists were first mentioned almost two thousand years ago by the historian Titus Livius, who described how someone invisible threw stones at Roman soldiers. After this unusual occurrence, poltergeist appearances were described many more times. Mentions of this phenomenon are even present in the chronicles of a French monastery. According to the chronicler, on September 16, 1612, something incredible happened in the house of the Huguenot priest François Perrault. It all started when, at midnight, the curtains began to close on their own, and someone was pulling the bed linen off the beds. An unusually loud noise was heard from various parts of the house, and someone was throwing dishes in the kitchen. The poltergeist not only methodically destroyed the house, but also cursed desperately. The Church decided that the devil had taken up residence in the house of a Huguenot sinner, and Martin Luther later proposed calling the “obscene spirit” a poltergeist. After 375 years in the USSR they will call him the drummer.
Heavenly signs
According to history, clouds are not only white-maned horses. Since time immemorial, eyewitness accounts have been preserved telling about whole pictures, meaningful signs and numbers that suddenly appeared in the sky. According to legend, one of these heavenly visions predicted victory for Julius Caesar, and another - a blood-red flag with a white cross - gave strength to the retreating Danish troops and helped them defeat the pagan Estonians.
Scientists are skeptical about such pictures in the sky and name several reasons for their appearance. Today, various figures in the sky can form aircraft exhaust. After aircraft fuel burns out, water vapor enters the atmosphere and immediately turns into ice crystals. Caught up in air vortices, they behave very unpredictably and can create various shapes. Aerosols based on carbon dioxide and barium salts sprayed during weather experiments can also cause such mysterious phenomena. In addition, air, due to its specific properties, sometimes acquires the ability to reflect what is happening on Earth.
The phenomenon of wandering graves
In 1928, all Scottish newspapers were full of news about a grave that had disappeared from the cemetery of the small town of Glenysville. Relatives who came to visit the deceased found an empty space instead of a stone tombstone. It was never possible to find the grave.
In 1989, on a Kansas farm, a grave mound with a lopsided and cracked headstone appeared overnight right in the middle of a barnyard. Due to the poor condition of the slab, it was impossible to read the name on it. But when the grave was excavated, a coffin with human remains was found in it.
All this mysterious devilry is considered commonplace in some African and Polynesian tribes. There is a tradition there of dousing a fresh grave with tree sap and covering it with shells. This is done, according to the priests, so that the grave “does not leave.”
Pyrokinesis
Cases where people engulfed in flames of unknown origin turned into a handful of ashes in just a few minutes have been known for a very long time. Although this phenomenon occurs infrequently: over the entire last century, only 19 cases of pyrokinesis were recorded in the world. Scientists cannot explain why this happens, and most importantly, why the flame often does not spread to surrounding objects.
In 1969, a man was found dead in his car. His face and hands were burned, but for some reason the fire did not touch his hair and eyebrows. A completely fantastic incident occurred in the Canadian province of Alberta. Two sisters flashed at the same instant, being in different parts of the city, a kilometer away from each other.
Versions of the origin of mysterious pyrokinesis are increasingly fantastic. Some doctors are trying to link spontaneous combustion of people with their internal state, since it is known that most victims were depressed for a long time. Others believe that it is mainly alcoholics who are affected by pyrokinesis. Their body is so saturated with alcohol that it can burst into flames at the slightest spark, especially if the deceased smoked. There is a version that the flame arises under the influence of either ball lightning that happens to be nearby, or energy beams unknown to science. And recently a completely incredible theory was put forward. Allegedly, the source of energy in a living cell is a thermonuclear reaction, that is, under the influence of an unknown force, inexplicable energy processes begin to occur in the cell, similar to those that occur during the explosion of an atomic bomb.
Interesting newspaper. The world of the unknown, No. 21 2013
Scientists have been trying to unravel the many mysteries of the natural world for many centuries, but some phenomena still baffle even the best minds of mankind.
From strange flashes in the sky after earthquakes to rocks that spontaneously move across the ground, these phenomena seem to have no particular meaning or purpose.
Here are 10 of the strangest, most mysterious and incredible phenomena found in nature. 1. Reports of bright flashes during earthquakes
Light flashes that appear in the sky before and after an earthquake
One of the most mysterious phenomena are the inexplicable flashes in the sky that accompany earthquakes. What causes them? Why do they exist?
Italian physicist Cristiano Feruga collected all observations of flashes during earthquakes dating back to 2000 BC. For a long time scientists were skeptical about this strange phenomenon. But everything changed in 1966, when the first evidence appeared - photographs of the Matsushiro earthquake in Japan.
Nowadays there are a great many such photographs, and the flashes on them are so different colors and shapes that it is sometimes difficult to distinguish a fake. 
Theories explaining this phenomenon include heat caused by friction, radon gas and the piezoelectric effect - electric charge, which accumulates in quartz rocks when tectonic plates move.
In 2003, physicist NASA Dr. Friedemann Freund conducted a laboratory experiment and showed that the flashes were probably caused by electrical activity in the rocks.
The shock wave from an earthquake can change the electrical properties of silicon and oxygen-containing minerals, allowing them to transmit current and emit a glow. However, some believe that the theory may only be one possible explanation.
2. Nazca Drawings
Huge figures drawn on the sand in Peru by ancient people, but no one knows why 
The Nazca Lines extend over 450 square meters. km of coastal desert, are huge works of art left on the Peruvian plains. Among them there are geometric figures, as well as drawings of animals, plants and rarely human figures, which can be seen from the air in the form of huge drawings.
They are believed to have been created by the Nazca people during a 1000 year period between 500 BC. and 500 AD, but no one knows why.
Despite its status as a World Heritage Site, Peruvian authorities have difficulty protecting the Nazca Lines from settlers. Meanwhile, archaeologists are trying to study the lines before they are destroyed. 
It was initially assumed that these geoglyphs were part of the astronomical calendar, but this version was later refuted. Researchers then focused their attention on the history and culture of the people who created them. Whether the Nazca Lines are a message to aliens or represent some kind of encrypted message, no one can say.
In 2012, Yamagata University in Japan announced that it would open Research Center on site and intends to study more than 1,000 drawings over the course of 15 years.
3. Migration of Monarch Butterflies
Monarch butterflies find their way across thousands of kilometers to specific locations. 
Every year, millions of North American monarch butterflies migrate more than 3,000 km south to winter. For many years no one knew where they were flying.
In the 1950s, zoologists began tagging and monitoring the butterflies and discovered that they were found in a mountain forest in Mexico. However, even knowing that monarchs choose 12 of the 15 mountainous sites in Mexico, scientists still cannot understand how they navigate. 
According to some studies, they take advantage of the position of the Sun to fly south, adjusting to the time of day using the circadian clock of their antennae. But the Sun only gives general direction. How they settle in is still a mystery.
One theory is that geomagnetic forces attract them, but this has not been confirmed. Only recently have scientists begun to study the features of the navigation system of these butterflies.
4. Ball lightning
Fireballs that appear during or after a thunderstorm 
Nikola Tesla supposedly created ball lightning in his laboratory. In 1904, he wrote that he had "never seen fireballs, but he was able to determine their formation and reproduce it artificially."
Modern scientists have never been able to reproduce these results.
Moreover, many are still skeptical about the existence of ball lightning. However, many witnesses, dating back to the era Ancient Greece, claim to have observed this phenomenon.
Ball lightning is described as a sphere of light that appears during or after a thunderstorm. Some claim to have seen ball lightning passes through window glass and down the chimney.
According to one theory, ball lightning is plasma; according to another, it is a chemiluminescent process - that is, light appears as a result of a chemical reaction.
5. Moving stones in Death Valley
Stones that slide along the ground under the influence of a mysterious force 
In the Racetrack Playa area of Death Valley, California, mysterious forces push heavy rocks across the flat surface of a dry lake when no one is looking.
Scientists have been puzzling over this phenomenon since the beginning of the 20th century. Geologists tracked 30 rocks weighing up to 25 kg, 28 of which moved more than 200 meters over a 7-year period.
Analysis of the stone tracks shows that they moved at a speed of 1 m per second and in most cases the stones slid in winter.
There were suggestions that wind and ice, as well as algae mucus and seismic vibrations, were to blame. 
A 2013 study tried to explain what happens when water on the surface of a dry lake freezes. According to this theory, ice on rocks stays frozen longer than the ice around them because the rock releases heat faster. This reduces the friction between the stones and the surface, making them easier to push around in the wind.
However, no one has yet seen the stones in action, and recently they have become immobile.
6. The Rumble of the Earth
An unknown hum that only some people can hear 
The so-called “hum” is the name given to the annoying low-frequency noise that disturbs residents around the world. However, few are able to hear it, namely only every 20th person.
Scientists attribute the "hum" to ringing in the ears, distant crashing waves, industrial noise and singing sand dunes.
In 2006, a researcher from New Zealand claimed to have recorded this anomalous sound.
7. The return of the cicada insects
The insects that suddenly woke up after 17 years to find a partner 
In 2013, cicadas of the species Magicicada septendecim, which had not been seen since 1996, emerged from the ground in the eastern United States. Scientists don't know how the cicadas knew it was time to leave their underground habitat after sleeping for 17 years.
Periodical cicadas are quiet and solitary insects that spend most of their time buried underground. They are the longest-lived insects and do not mature until they are 17 years old. However, this summer, they woke up en masse to reproduce.
After 2-3 weeks they die, leaving behind the fruits of their “love”. The larvae burrow into the ground and a new life cycle begins. 
How do they do it? How do they know after so many years that the time has come to emerge?
Interestingly, 17-year cicadas appear in the northeastern states, while in the southeastern states, cicada invasions occur every 13 years. Scientists have suggested that this life cycle of cicadas allows them to avoid meeting their predator enemies.
8. Rain of Animals
When different animals, such as fish and frogs, fall from the sky like rain 
In January 1917, biologist Waldo McAtee presented his paper entitled “Rain of Organic Matter,” which reported falling larvae of salamanders, small fish, herring, ants, and toads.
Rains of animals have been reported in various parts of the world. For example, frogs rained down in Serbia, perches fell from the sky in Australia, and toads fell in Japan.
Scientists are skeptical about their animals' rain. One explanation was proposed by a French physicist back in the 19th century: winds lift animals and throw them to the ground.
According to a more complex theory, waterspouts suck out aquatic life, transporting them and causing them to fall in certain places.
However scientific research There have been no studies to confirm this theory.
9. Stone balls of Costa Rica
Giant stone spheres whose purpose is unclear 
Why the ancient people of Costa Rica decided to create hundreds of large balls of stone is still a mystery.
Costa Rica's stone balls were discovered in the 1930s by the United Fruit Company when workers were clearing land for banana plantations. Some of these balls having a perfect spherical shape, reached 2 meters in diameter. 
The stones, which locals call Las Bolas, date back to 600 - 1000 AD. What makes this phenomenon even more difficult to understand is the fact that there is no written record of the culture of the people who created them. This happened because the Spanish settlers erased all traces of the indigenous cultural heritage.
Scientists began studying the stone balls in 1943, charting their distribution. Later, anthropologist John Hoopes refuted many theories explaining the purpose of the stones, including lost cities and space aliens.
10. Impossible fossils
Remnants of long-dead creatures that appear in the wrong place 
Ever since the theory of evolution was proposed, scientists have encountered discoveries that seem to challenge it.
One of the most mysterious phenomena was fossil remains, especially human remains, which appeared in unexpected places.
Fossilized prints and tracks have been discovered in geographic areas and archaeological time zones to which they did not belong.
Some of these discoveries may provide new information about our origins. Others turned out to be mistakes or hoaxes. 
One example is the discovery in 1911, when archaeologist Charles Dawson collected fragments of a supposedly unknown ancient man from big brain, dating back 500,000 years ago. Big head Piltdown Man led scientists to believe he was the "missing link" between humans and apes.