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A new subterranean realm is discovered deep in the caves of Vietnam, in this clip from Season 18, "Secrets of Inner Earth." Watch all new episodes of Ancient Aliens, Fridays at 8/7c, and next day on The HISTORY Channel website at http://history.com/schedule. #AncientAliens Subscribe for more ...

The Galaxy is approximately 13 billion years old, which makes one wonder - just how many civilizations could have come and gone across that ocean of time? Today, we try something a little bit different for this channel, and imagine when and how the first civilization could have lived. The story ...

Scientist claim that Aliens in 1,700 star systems may have observed civilization emerge on Earth. Today, we take a look at what this scientist said about Aliens and Alien life. Earth is perfectly positioned so that at least 1,715 nearby star systems are in view. It stands to reason that if there ...