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 ...

These ancient structures hold not only history but deep secrets that will soon be revealed. See more 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 ...

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 ...

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 ...

Experts examine a piece of cloth that is believed to be the actual burial clothes of Jesus Christ. See more in this 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 ...

Who really created the Easter Island monoliths? 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 ...

On every continent, there are stories of children who "stand out" for their strange abilities and advanced knowledge. They are said to have knowledge of things they shouldn't or couldn't know. See more in this marathon from Ancient Aliens. Watch all new episodes of Ancient Aliens, Fridays at ...

Legends of lost and mysterious islands, advanced civilizations and Eden-like paradises have been told by sailors throughout human history. Is it possible these stories are more than just the myths of imaginative seafarers? See more in Season 6, Episode 9, "Aliens and Forbidden Islands." Watch ...

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 ...