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 ...

Are recent breakthroughs in medicine the result of years of research? Or does the knowledge of healing really come from an otherworldly source? See more in Season 6, Episode 6, "Alien Operations." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

One of the most compelling arguments for the Ancient Astronaut theory is the extraordinary engineering behind the construction of megalithic sites worldwide. See more in this scene from Season 1, Episode 1, "Extraordinary Engineering." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, ...

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. ...

Si una nave extraterrestre se estrelló en Roswell y el Ejército lo quiso encubrir ¿Fueron capaces de ocultar todas las pruebas y restos de metal? Este Geólogo está convencido de no y de que ha encontrado un resto que olvidaron enterrado. Descubriremos la verdad que se esconde este pequeño trozo ...

Puma Punku in Bolivia features some of the largest stone blocks on Earth, each carved with incredible precision. See more in this scene from Season 20, Episode 20, "Resurrecting Puma Punku." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your favorite ...

Many ancient cities are thought to be lost forever-if they ever existed at all. 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 ...