United States of America

Mammoth Cave National Park: The Longest Cave in the World and Much More; Katherine Gallagher; TreeHugger

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Photo: ColorPlayer

Explore Mammoth Cave National Park with Katherine Gallagher’s list of 10 mind-blowing facts, including its unique karst topography, springs, caves, and rich history.

Source: Mammoth Cave National Park: The Longest Cave in the World and Much More

Categories: United States of America

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