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 ...

For thousands of years, humankind has attempted to make contact with beings from beyond Earth. See more in this scene from Season 20, Episode 14, "The Search For Extraterrestrial Intelligence." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

Ancient myths of small gray beings with black oval eyes are uncovered. See more in this marathon 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. ...

Have extraterrestrial beings shaped our history? Discover the truth in this marathon 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 ...

Are these petroglyphs proof that Earth has been visited by extraterrestrials?! See more in Season 19, Episode 20, "The Top Ten Alien Petroglyphs." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more ...

Ancient Astronaut theorists propose these sites are remnants of a lost extraterrestrial electrical system--one erected to draw energy from the Earth. See more in this clip from Season 1, Episode 8, Energy Lines And Hot Spots. Watch your favorite episodes of Ancient Aliens on The HISTORY ...

A possible black hole is created during a Menlo Park experiment. See more in this scene from Season 1, Episode 8, "Energy Lines and Hot Spots." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

Ancient Astronaut Theorists believe that Caral-Supe was once a thriving civilization that might’ve received help from extraterrestrials, in this clip from Season 17, "The Lost City of Peru." #AncientAliens Watch all new episodes of Ancient Aliens, returning September 17 at 9/8c, and stay up to ...

While "the cloud" is a seemingly recent development, ancient astronaut theorists point out that this idea of an other-worldly repository of cosmic information first appeared in ancient Hindu scriptures in this clip from Season 12, Episode 10, "The Akashic Record". Subscribe for more from Ancient ...

Join us at AlienCon to see your favorite experts from Ancient Aliens! In Sirpur, India, the Surang Tila Temple was the only building to survive a devastating 11th-century earthquake. Ancient astronaut theorists believe its advanced Ayurvedic architecture was knowledge passed on from aliens in ...

Join us at AlienCon to see your favorite experts from Ancient Aliens! Many religions of the world, including Tibetan and Kabbalistic traditions believe in rebirth of the spirit as can be seen in this clip from Season 12, Episode 13, "The Replicants". #AncientAliens Subscribe for more from ...

Join us at AlienCon to see your favorite experts from Ancient Aliens! Ancient astronaut theorists suggest that alien contact with the Japanese dates back thousands of years and can be found within the teachings of Shintoism in this clip from Season 12, Episode 14, "A Spaceship Made of Stone". ...