Check out these amazing ancient civilizations. See more in this Ancient Aliens compilation. Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for ...

Ancient Aliens is counting down the world's top ten most mysterious sites. See more in this marathon from Ancient Aliens. New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Luminous relics in the shape of human skulls. Otherworldly artifacts believed to harness the secrets of the universe. Are the Crystal Skulls part of an elaborate hoax? See more in Season 6, Episode 2, "The Crystal Skulls." New Season Fri., Feb. 7 at 9/8c; Stream Next Day, and stay up to date ...

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 ...

Explore the ancient ruins of Teotihuacán 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. #AncientAliens Subscribe for more from ...

Across ancient civilizations, the world's mountains were viewed as the sacred home to all-powerful gods. See more in Season 6, Episode 11, "Aliens and Mysterious Mountains." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite shows on The ...

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 ...

Check out these insane moments 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. #AncientAliens Subscribe for more from Ancient ...

Did aliens help us out in the war?! See more in this scene from Season 1, Episode 2, "Ancient Close Encounters." 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. ...

More than 10,000 crop circles have been reported worldwide, on nearly every continent on earth. See more in Season 1, Episode 17, "Circles, Rituals and Shamans." 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 ...

Were these lethal weapons the product of human innovation--or were they created with help from another, otherworldly source? 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 ...

For thousands of years, mankind has told tales of encounters with strange, soulless creatures. Are these beliefs merely man made fabrications--or could there be extraterrestrial origins in earthly encounters with the undead? See more in Season 2, Episode 9, "Aliens: Dead or Alive." Watch all ...