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United States

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The Mammoth Cave National Park entrance sign at the park’s eastern entrance in the fall. Mammoth Cave, discovered in 1791, is 668 km (415 mi) long and was designated a World Heritage Site in 1981. Image courtesy of the US National Park Service.

The Mammoth Cave National Park entrance sign at the park's eastern entrance in the fall. Mammoth Cave, discovered in 1791, is 668 km (415 mi) long and was designated a World Heritage Site in 1981. Image courtesy of the US National Park Service.

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