For thousands of years, in cultures throughout the world, people have practiced elaborate techniques to preserve the human body after death. See more in Season 9, Episode 5, "Secrets of the Mummies." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your ...

Researchers find mysterious aztec codices in Mexico City. See more in this clip from Season 21, Episode 7, "Mysteries of the Aztecs." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at ...

Follow David Childress as he investigates mysteries around the world. See more in this Ancient Aliens compilation. Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

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In a sensational interview with a military intelligence officer it is revealed that there’s is a secret taskforce that investigates UFO aircrafts. See more in this clip from Season 21, Episode 5, "The Top Ten Secret Projects." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up ...

Throughout history, many of the world's greatest thinkers have helped push civilization forward with their profound insights and extraordinary abilities. See more in Season 9, Episode 4, "The Genius Factor." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of ...

Experts take a deep dive into demonic theories. See more in this Ancient Aliens compilation. Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for ...

Check out these out of these world theories. See more in this Ancient Aliens compilation. Chapter 1 - 0:00 Chapter 2 - 15:09 Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Do stories from the ancient past hold evidence of alien overseers? See more in Season 9, Episode 3, "Aliens Among Us." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule. ...

Highly advanced mathematical theories are discussed in this Ancient Aliens compilation. Watch all new episodes Fridays 9/8c; Stream Next Day, 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 ...

Check out these unexplainable theories! See more in this Ancient Aliens compilation. Watch all new episodes Fridays 9/8c; Stream Next Day, 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 ...

Just along the western bank of the Nile River lies the Great Pyramid of Giza, home to multiple chambers. See more in this clip from Season 21, Episode 4, "The Top Ten Unexplained Technologies." Watch all new episodes Fridays 9/8c; Stream Next Day, and stay up to date on all of your favorite ...