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These 5 cities vanished without a trace. We're finally learning their stories.
Historical sources are overflowing with mentions of places like Tanis, Helike, and Roanoke, but archaeologists are still searching for their exact locations. The histories they're piecing together are astonishing.
Mohenjo-Daro was one of two prominent cities of the ancient Indus Valley civilization. The citadel, a center of activity at the city's peak, towers over the ruins today.
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