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.
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Archaeologists Uncover 'Giant' Gate To Goliath's Home City Of GathArchaeologists have uncovered what they believe to be the ancient city of Gath, home of the Giant Goliath. Check out the video below for more info. ... 
