This National Park Has the Longest-known Cave System in the World — With Over 400 Miles of Underground Passages, Sparkling Domes, and a Frozen Waterfall
travelandleisure.com
This National Park Has the Longest-known Cave System in the World — With Over 400 Miles of Underground Passages, Sparkling Domes, and a Frozen Waterfall
Mammoth Cave National Park in Kentucky, home to more than 400 miles of underground passageways, sees approximately 500,000 visitors annually. Here's the best time to visit, plus where to stay and what to do while there.
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