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. ...

Around the world and throughout history, people have reported seeing very similar types of unidentified objects in the sky. 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 ...

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 ...

Watch these unbelievable mysteries that took place in Peru, 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 ...

At Falcon Lake, Canada, one of the most infamous - and dangerous - UFO sightings took place on May 20, 1967. Learn more in this clip from The UnXplained, "Alien Contagion." Watch your favorite episodes of The UnXplained, and stay up to date on all of your favorite The HISTORY Channel shows at ...

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 ...