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Ancient Astronaut theorist Giorgio A. Tsoukalos looks into unexplained mysteries that suggest humans are not alone in the universe.

In Search of Aliens

The Alien Code

Nazca is one of the most mysterious sites on Earth; the vast desert is covered with hundreds of ancient geoglyphs depicting animals, human-like figures and strange geometric designs.

The Mystery of Nazca

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

UnXplained Zone

Washington D.C. architecture was inspired by the ancient world, as seen in the Greek pillars, Roman domes and even an Egyptian-style obelisk that mark the landscape.

The Founding of America

The possibility that the ruins of Puma Punku offer evidence of advanced technology being used in the ancient past.

The Mystery of Puma Punku

Megalithic structures on the Mediterranean island of Malta offer possible clues to an extraterrestrial connection; investigating stories of the legendary creatures of the island's local folklore.

The Mystery of the Cyclops

Giorgio joins anthropologist Dr. Jeff Meldrum for an overnight expedition on Washington's Olympic Peninsula in an attempt to capture evidence of Bigfoot.

Searching for Bigfoot

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HISTORY VAULT

An unusually smooth and magnetic rock with a cryptic design was found in Roswell, N.M., in 2004.

The Roswell Rock

Sightings of creatures similar to the Loch Ness Monster have been documented all over the world for hundreds of years.

The Mystery of Loch Ness

Nazi scientists developed advanced weapons, including the Die Glocke, which is believed to have been a time travel device.

Nazi Time Travelers

Ancient Astronaut Theorist Giorgio A. Tsoukalos looks at recent discoveries related to the story of the lost city of Atlantis.

The Hunt for Atlantis

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Alien-life theorist Giorgio Tsoukalos explores some of the world's famous mysteries.

S1 E4 | The Roswell Rock

E10 | The Alien Code

E9 | The Mystery of Nazca

E8 | The Founding of America

E7 | The Mystery of Puma Punku

E6 | The Mystery of the Cyclops

E5 | Searching for Bigfoot

E4 | The Roswell Rock

E3 | The Mystery of Loch Ness

E2 | Nazi Time Travelers

E1 | The Hunt for Atlantis