One of the most compelling arguments for the Ancient Astronaut theory is the remarkable engineering evident in the construction of ancient megalithic sites worldwide. See more in this scene from Season 1, Episode 1, "Extraordinary Engineering." Watch all new episodes of Ancient Aliens, Fridays ...

This Canadian official made a shocking announcement on international TV. See more in this #Short from Ancient Aliens Special Presentation. Subscribe for more HISTORY: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY content: History Newsletter - https://histv.co/newsletter ...

Did we lose access to technologies of ancient civilizations? See more in this compilation from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Watch these unbelievable mysteries that took place in Peru, in this compilation from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...

Advanced extraterrestrial civilizations may have altered the course of human history, challenging everything we know about our origins. This supernatural documentary dives into theories of alien influence on ancient civilizations, questioning accepted timelines and offering a bold reimagining ...

Has NASA found definitive signs of life on Mars that they're intentionally keeping from the public? See more in this compilation from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

For more than four decades, award-winning journalist Linda Moulton Howe has covered the most mysterious phenomena on Earth. See more in this scene from Season 20, Episode 18, "The Linda Moulton Howe Files." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all ...

Are we truly alone, or have extraterrestrials been guiding us all along? Learn more in this full episode marathon of "Ancient Aliens." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Will anyone be able to solve the mystery of the Bermuda Triangle? See more in this compilation from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Be warned: these 4 stories of alien abductions will absolutely terrify you, in this Ancient Aliens compilation. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Uncover the mysteries of the world’s forgotten wonders! From the hidden stone city of Petra to the towering pyramids of Giza, each of these ancient monuments holds untold secrets. Travel through time as we explore Machu Picchu high in the Peruvian mountains and the enigmatic stone circle of ...

Are these people the descendants of star beings? See more in this compilation from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens ...