For almost as long as we've had civilization, we've lost it. There are records going back hundreds of years of explorers discovering huge temples encrusted with jungle, or giant pits full of treasure that were once grand palaces. Why did people abandon these once-thriving cities, agricultural centers, and trade routes? Often, the answer is unknown. Here are ten great civilizations whose demise remains a mystery.
The Mysterious Stardust Ranch | Aliens, UFOs & Paranormal Activity | DocumentaryThis video explores the strange stories and encounters John Edmonds has shared over the years, involving his battle with extraterrestrials and other unexplained activity ... 
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The World's 10 Most Mysterious Underwater AnomaliesFrom the Bimini Road to the Lake Michigan Stonehenge, here are ten mysterious underwater anomalies for you to check out. ... 
5 Strangest & Most Mysterious Pieces Of Footage Caught By NASAWe have all heard about NASA. The National Aeronautics and Space Administration that covers all thing to do with space research and exploration. Well its no surprise tha ... 
Underwater Abominable Snowman / The Edwards IncidentBeyond Creepy looks at two cases. In the first, a diver claims to have had an encounter with an underwater creature in the 1960s. In the second, two security guards enco ... 
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