Scotland’s Overtoun Bridge has a dark history of dogs leaping to their death into a gorge, perhaps as many as 50 dogs over the past half-century. What is drawing these dogs over the edge?

Mysterious objects near a 747 catch the attention of an experienced pilot over Alaska. Is the government covering up the truth about the unidentified flying objects?

For the first time, a retired Catholic monk who attended the real exorcism that inspired 'The Exorcist' reveals what he saw.

A former reform school has a haunting past that may explain strange sightings of so-called Shadow People. An amateur video purports to capture these beings on camera.

Southeast of Mexico City, hundreds goats are found dead and completely drained of blood. Is this the work of the legendary chupacabra?

On March 24, 1967, men see an unidentified object hovering over Montana’s Malmstrom Air Force Base, home to nuclear weapons, which are all disabled simultaneously.

A 10-mile-long, 2-mile-wide lake in Siberia is one of the most remote bodies of water on Earth. Locals have claimed a sea creature lives in the icy waters.

Zombies are popular in American movies and TV but in Haiti, stories of zombies have deep roots. Did this woman come back from the dead?

A fireball in the sky over Sri Lanka in 2012 is followed days later by a mysterious downpour of red rain. During the search for a rational explanation, investigators find evidence of strange living cells with no earthly comparison.

There have been cases of livestock discovered dead around the world, robbed of their blood and organs. Authorities are baffled. Paranormal investigator Chuck Zukowski examines the evidence and argues that aliens could be a suspect.

Around the world, livestock has been found dead, drained of blood, with organs surgically removed. See real photo evidence and get firsthand accounts of this grisly phenomenon.

A 2005 discovery could change everything we know about archaeology: five ancient pyramids in a Bosnian valley. Excavating the site could provide clues to whether they are natural or manmade.

From dragons to the Loch Ness Monster, mythical beasts have infiltrated many cultures. Is global warming creating conditions to help sea creatures breed?

In Bosnia and Herzegovina, reports say the sun appears to defy the laws of nature. Some believe it's a religious miracle or that it has a supernatural element.

Frank Baker talks about his experience when he suddenly burst into flames. The doctors concluded he burned from the inside out and was a victim of partial spontaneous combustion.

In 1980, a British police officer claimed he saw a UFO. Was the sighting linked to a dead body found “as if dropped from the sky”? Was there a cover-up?

A fireball in the sky over Sri Lanka in 2012 is followed days later by a mysterious downpour of red rain. During the search for a rational explanation, investigators find evidence of strange living cells with no earthly comparison.

On March 24, 1967, men see an unidentified object hovering over Montana’s Malmstrom Air Force Base, home to nuclear weapons, which are all disabled simultaneously.

Bizarre, hairless, blue-eyed and hunch-backed creatures have invaded Texas, attacking and mutilating livestock. Now there is evidence they are breeding and their population is set to explode. Scientists are mystified, the authorities are in denia ...

Southeast of Mexico City, hundreds goats are found dead and completely drained of blood. Is this the work of the legendary chupacabra?

Hear from Director Sean Smith and go behind the filming of Fred Valentich's story - the pilot who mysteriously vanished along with his plane over Australia in 1978.

A strange dog-like predator has been spotted in Texas and believed to be responsible for slaughtering livestock and draining the corpses of blood. Could it be related to the chupucabra?

Area 51 in Nevada is America's most secret air base. State-of-the-art aircraft have been developed here for decades, but does it also hold clues to UFOs?

Pilot Fred Valentich's last words were "it’s above me and it’s not an aircraft." Then a mysterious metallic sounded through the radio just before the pilot and his plane vanished without a trace. Is this evidence of UFO contact?

Why would sailors mysteriously vanish from a boat, leaving behind all of their equipment with no signs of struggle?

Mysterious phenomena and bizarre sightings seems to follow one distinct geographic line across America: a paranormal highway.

In 1996, a startling find in Russia raised many questions. Is this a tiny, deformed baby or a creature from out of this world?

Residents of a small Italian village report everyday objects suddenly bursting into flames for no apparent reason. Are the mysterious fires connected to something alien?

Northern Europe's Baltic Sea is one of the most dangerous seas on Earth and hides a thousand wrecks on its bottom. One massive finding under its surface isn't like the others, however.

Cusco was the capital of the ancient Inca civilization and home to some of the Incas' most sacred sites. Is this skeleton from a human sacrifice or something extraterrestrial?

The Flannan Isles is a desolate place, home to one of Scotland’s greatest mysteries: three lighthouse keepers who vanished without a trace. Was it a rogue wave or something more sinister?

In 1980, a British police officer claimed he saw a UFO. Was the sighting linked to a dead body found “as if dropped from the sky”? Was there a cover-up?