Every continent has its ruins - places where only stones tell the tale of a fallen people. They might lay buried under the Earth, in the shade of jungle canopy or amidst the teeming industry of a modern city. However, they all raise the same questions: How could something so great all but vanish? Why do civilizations collapse?
In this 6-part series, we uncover the scientific reasons why some of history's most fascinating peoples have disappeared in the face of the natural world's might.
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