From ancient megaliths to inexplicable stone structures found across the globe, revisit theories suggesting possible otherworldly influence behind some of humanity’s most mysterious architectural feats. See more in this Ancient Aliens compilation. Ch1 0:00 - The Ruins of Copan Ch2 4:43 - Legendary Carnac Stones Ch3 12:07 - Where are all the Tools at Gobekli Tepe? Ch4 18:31 - Carnac Stones' Curious Geometry 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. 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.