Ancient Aliens has followed investigators across the globe as they’ve gone directly to the sites where unexplained incidents have been reported. Now, Giorgio Tsoukalos takes a look back at the most extraordinary encounters that, as far as he’s concerned, provide evidence of an extraterrestrial presence on Earth.See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.