In just the last few thousand years, massive civilizations have crumbled and disappeared... but why?? In this video, Unveiled looks at the Ancient Mayans, the Olmecs, the Indus Valley Civilization, the North American city of Cahokia and more... to discover why great societies rise and fall.

This is Unveiled, giving you incredible answers to extraordinary questions!

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Did Ancient Civilisations Have Modern Technology? - https://www.youtube.com/watch?v-w3hCpjsKtw

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