For thousands of years, humankind has attempted to make contact with beings from beyond Earth. See more in this scene from Season 20, Episode 14, "The Search For Extraterrestrial Intelligence." Watch all new episodes of Ancient Aliens, Fridays at 9/8c, and stay up to date on all of your ...

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. See more in this scene from Season 20, Episode 12, "Unlocking the Stargates." Watch all new episodes of ...

For thousands of years, cultures around the world have held a belief in stargates through which beings have traveled to Earth from distant points in the universe and even other dimensions. See more in this scene from Season 20, Episode 12, "Unlocking the Stargates." Watch all new episodes of ...

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 ...

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 ...

Massive object travels at 500 MPH! See more in this scene from Season 20, Episode 8, "The UFO Superhighway." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from Ancient Aliens and other great The ...

Could it be that Scotland is a magnet for extraterrestrial visitors? Find out in this clip from Season 20, Episode 9, "MYSTERIES OF SCOTLAND." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

For thousands of years, Scotland has been an epicenter of otherworldly phenomena. See more in Season 20, Episode 9, "Mysteries of Scotland." Watch your favorite episodes of Ancient Aliens on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more from ...

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 this scene from Season 20, ...