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. ...

These unexplainable theories surrounding children and aliens are finally disclosed. 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 ...

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Check out these unexplainable alien connections. 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 this world alien theories. See more in this Ancient Aliens marathon. 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 life altering alien crashes. 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 ...

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 ...

Check out these most mysterious theories. See more in this Ancient Aliens marathon. 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 ...

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 ...

Is Skinwalker Ranch a portal to the unknown? This mysterious location is known for UFO sightings, paranormal activity, and strange phenomena that defy explanation. Scientists and researchers have uncovered eerie evidence that suggests something beyond our understanding is happening here. Could ...