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Ancient alien theorists wonder about the depiction of a stegosaurus in Angkor Wat, the world's largest ancient religious temple, and ask how the ancients could have known about dinosaurs.

Ancient Aliens

Aliens and Dinosaurs

Considering the possibility that sightings of alien beings or UFOs may be evidence of time travelers from the future.

The Time Travelers

Examinig Leonardo da Vinci's paintings, sketches and journals looks for knowledge of otherworldly technology and aliens.

The Da Vinci Conspiracy

While ancient myths and legends speak of an ape-like giant stalking the earth, theorists speculate that Bigfoot creatures belong to an alien species that once visited Earth in the distant past.

Aliens and Bigfoot

A 14,000-year-old set of ruins with complex interlocking blocks defies explanation; some believe their origin may be extraterrestrial.

The Mystery of Puma Punku

Research into alien contact in the recent past including evidence from former astronauts, secret government files, and NASA scientists.

The NASA Connection

UnexplJoin top investigators as they seek to uncover the truth behind some of the world’s greatest mysteries and cover-ups

UnXplained Zone

Natural disasters in the ancient world, including volcanic eruptions, earthquakes, floods, and meteor strikes may have originated with the meddling of celestial beings.

Aliens and Mega-Disasters

Beings with big heads and giant eyes are called the greys and have been depicted in ancient rock art and carved stone figurines found all over the world.

The Greys

The end of the Mayan Long Count Calendar and potential alien explanations for what may come.

The Doomsday Prophecies

Extraterrestrial visitors may have influenced Mayan culture and helped ancient Mayans make striking advances in science, mathematics, time keeping, and astronomy.

The Mayan Conspiracy

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Texts, archaeology and legend contain evidence of past human-extraterrestrial contact.

S4 E3 | The Greys