The Sumerians in ancient Mesopotamia achieved over one hundred "firsts" for human civilization. Advances in writing, agriculture, science, mathematics, medicine, astronomy, transportation, building, military, schools and city planning, all originated in Sumer. See more in this marathon from ...

Dr. Travis Taylor examines some mysterious Chilean UFO footage, in this clip from Season 15, "Destination Chile." 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. ...

Could these sightings, coming from every part of the world, from biblical times to present day, be evidence that aliens have been with us all along? See more in Season 1, Episode 4, "Closer Encounters." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of ...

Are extraterrestrials at the heart of the origins of life? 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. ...

If ancient aliens visited Earth, what was their mission, and is there evidence that points to when they will return? See more in Season 1, Episode 3, "The Mission." 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 ...

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 ...

From biblical patriarchs to modern day alien captives, throughout history, there have been people who claimed to have contact with otherworldly beings. And often bearing important messages for humanity. Could it be that they have been chosen to help carry out an extraterrestrial agenda? See ...

What if life on Earth began in outer space? See more in this special from Ancient Aliens, Season 1, Episode 99. 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. ...

Roswell, New Mexico hides dark interstellar secrets. Uncover the truth 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 ...

Did aliens really help to shape our history? See more in this two hour 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 ...

If ancient aliens visited Earth, who were they, and where did they come from? Possible historic evidence and beliefs are examined around the world. See more in Season 1, Episode 2, "The Visitors." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

Are these great Pharaohs and Gods from an extraterrestrial background? 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. ...