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?

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.

More than 100 elk are found dead on a ranch northeast of Santa Fe. All died within the last 24 hours, but the cause of death is a mystery.

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 pilot reported seeing three mysterious flying objects from his small plane near Mexico City. For the first time air traffic controller Julio Cesar Diaz talks about what he saw on his radar and believes it was a UFO.

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.

A paranormal investigator questions the local sheriff about a terrifying and mysterious fire that claimed the life of an apparent victim of spontaneous combustion. Hear from witnesses and see actual evidence from the scene.

People across the world suffer from a strange disease that officially does not even exist. Sufferers report horrific skin lesions, a sensation that insects are crawling under their skin, and unidentifiable multicolored fibers that sprout from the ...

A small town in Argentina seems to attract UFOs. A local mayor has recorded hundreds of UFOs over 20 years. In 1995 one crashes into a nearby mountain range - local pilot Tony Galvagno and his friends locate the crash site but are barred from inv ...

Two skeptics set out to prove that the Mothman is nothing but a hoax. But what they found was horrifying and changed them both forever.

Earth-shattering sounds that rumble the ground were reported in Cape Fear, North Carolina in 2009 and are still heard today. Are they earthquakes, secret military maneuvers, or something even stranger? Locals blame aliens.

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.

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.

Mysterious downpours of red rain were reported in Sri Lanka. During the search for an explanation investigators find evidence of strange living cells with no earthly comparison. Is this evidence of alien life?

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?

A discovery of bones belonging to seemingly giant people raise questions. Research looks to the real giants that live among us.

Meet Executive Producer Ben Fox and see how the livestock mutilation story was filmed. Find out how decisions by the cast and crew translate to what you see on film.