Archaeologists have found the remains of ancient civilizations at sites around the world that may explain how some cultures survived cataclysmic events in this clip from Season 9, Episode 3, "Aliens Among Us". #AncientAliens
Subscribe for more from Ancient Aliens and other great HISTORY shows: http://histv.co/SubscribeHistoryYT

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.

HISTORY® is the leading destination for awardwinning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s alloriginal programming slate features a roster of hit series, premium documentaries, and scripted event programming.