Like Ancient Aliens? Catch our new series The UnXplained with William Shatner, Fridays at 10/9c after Ancient Aliens! Ancient Astronaut Theorists believe they have the answer the mysterious disappearance of the Mayan civilization in this clip from Season 9, "The Vanishings". #AncientAliens Subscribe for more from Ancient Aliens and other great HISTORY shows: http://po.st/SubscribeToHistory Find out more about the show and watch full episodes on our site: http://po.st/AncientAliens Check out exclusive HISTORY content: History Newsletter: http://po.st/HistoryNewsletter Website - http://po.st/HistoryWeb Facebook - http://po.st/HistoryFacebook Twitter - http://po.st/HistoryTwitter "Ancient Aliens" explores the controversial theory that extraterrestrials have visited Earth for millions of years....
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