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Watch all new episodes of Ancient Aliens returning soon, and stay up to date on all of your favorite History Channel shows at history.com/schedule. A stunning find in a tunnel underneath the ancient city of Teotihuacan, Mexico, connects the Aztec calendar with the mysteries of the cosmos, in this clip from Season 7, "Aliens and the Red Planet." #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: histv.co/SubscribeToHistory Find out more about the show and watch full episodes on our site: histv.co/AncientAliens Check out exclusive HISTORY content: History Newsletter - histv.co/newsletter Website - histv.co/History Facebook - histv.co/Facebook Twitter - histv.co/Twitter "Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years. HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network's all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.