UFOs

Reverence for the number three dates back thousands of years. What is it about this number that continues to fascinate mankind? The U.S. military has long denied that the infamous 1947 Roswell crash was anything other than a weather balloon. See more in Season 2, Episode 14, "Mysteries By the Numbers."

Watch full episodes and stay up to date on all of your favorite shows on The HISTORY Channel website at http://history.com/schedule.

#AncientAliens

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"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

The HISTORY® Channel, a division of A+E Networks, is the premier destination for historical storytelling. From best-in-class documentary events, to a signature slate of industry leading nonfiction series and premium fact-based scripted programming, The HISTORY® Channel serves as the most trustworthy source of informational entertainment in media. The HISTORY® channel has been named the #1 U.S. TV network in buzz for seven consecutive years by YouGov BrandIndex, and a top favorite TV network by Beta Research Corporation. For a deeper dive, visit history.com or follow @history on Instagram, Twitter, Facebook, YouTube and TikTok. For additional press materials visit the A+E Networks Press Center at http://press.aenetworks.com.

Ancient theorists meet in Santa Monica to decipher important cave art. See more in this clip from Season 1, Episode 5, "Mysterious Underground Worlds."

Watch full episodes 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 Ancient Aliens and other great The HISTORY Channel shows:
http://histv.co/SubscribeHistoryYT

Find out more about the show and watch full episodes on our site:
https://histv.co/AncientAliens

Check out exclusive The HISTORY Channel content:
History Newsletter – https://histv.co/newsletter
Website – https://histv.co/History
Facebook – https://histv.co/Facebook
Instagram – https://www.instagram.com/history
TikTok – https://www.tiktok.com/@history

"Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years.

The HISTORY® Channel, a division of A+E Networks, is the premier destination for historical storytelling. From best-in-class documentary events, to a signature slate of industry leading nonfiction series and premium fact-based scripted programming, The HISTORY® Channel serves as the most trustworthy source of informational entertainment in media. The HISTORY® channel has been named the #1 U.S. TV network in buzz for seven consecutive years by YouGov BrandIndex, and a top favorite TV network by Beta Research Corporation. For a deeper dive, visit history.com or follow @history on Instagram, Twitter, Facebook, YouTube and TikTok. For additional press materials visit the A+E Networks Press Center at http://press.aenetworks.com.