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Lost cities of the world: What happened to these once-great civilizations?

Something haunting happens when you stand in the ruins of a place once teeming with life. The silence speaks louder than the ...
Las Vegas News on MSN

9 great civilizations that mysteriously vanished

The Classic Maya: Drought Meets Political Turmoil The Classic Maya: Drought Meets Political Turmoil (Image Credits: Wikimedia) Think about it: one of the most sophisticated societies the Americas ever ...