Explore the tantalizing theory of extraterrestrial viruses seeding life on Earth in this scene from Season 2, Episode 3, "Interstellar Fallout". Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more ...

Unravel the mysterious crash of an NYPD pilot's encounter with an unidentified flying object in this scene from Season 2, Episode 4, "Extraterrestrial Close Encounters". Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. ...

These ancient "wheels of knowledge" can be found all across the globe. See more in this scene from Season 2, Episode 7, "Alien Outposts." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

Do the mysteries of Easter Island have something to do with extraterrestrial beings? See more in this scene from Season 2, Episode 10, "Alien Effigies." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for ...

Ancient Aliens is counting down ten of the most intriguing--and mysterious--symbols and codes found across the globe that just might contain proof of otherworldly contact. See more in this scene from Season 20, Episode 5, "The Top Ten Alien Codes." Watch your favorite episodes of Ancient ...

According to Francis Crick, human DNA was far too complex to have evolved over the history of planet earth, which led to theories of extraterrestrial interference with human DNA, in this clip from Season 17, "The Human Experiment." #AncientAliens Subscribe for more from Ancient Aliens and ...

More than 7,000 years ago, the ancient Sumerians established what is considered the world's first civilization, and they credited their extraordinary achievements to their gods, the Anunnaki. See more in this scene from Season 20, Episode 7, "Secrets of the Sumerians." Watch your favorite ...

Throughout the world there are mysterious ancient stones shaped into perfect spheres. Many of them show clear evidence of being manmade and some completely defy explanation. Could the mystery of the stone spheres provide clues about humankind's alien past? See more in Season 20, Episode 10, ...

These colossal statues are more than just statues, they may have connections to another world. See more in this scene from Season 2, Episode 10, "Alien Effigies." 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 ...

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Could these artifacts really have extraterrestrial origins? See more in this compilation from Ancient Aliens! 00:00 - Impossible Artifacts Possess an Extraterrestrial Connection 02:12 - Mysterious 2,000-Year-Old Skull Linked to Alien Life 07:40 - Ancient Artifacts Extraterrestrial Origins ...

In 1849, ancient Babylonian Star Catalogs were discovered in Iraq, providing proof of celestial knowledge given by extraterrestrials, in this clip from Season 5, "Destination Orion." #AncientAliens Subscribe for more from Ancient Aliens and other great shows from The UnXplained Zone: ...