Mammoth Cave National Park, a World Heritage Site located in the state of Kentucky, has the world's largest network of natural caves and underground passageways, which are characteristic examples of limestone formations. The park and its underground network of more than 560 surveyed km of passageways are home to a varied flora and fauna, including a number of endangered species.
Unesco: Mammoth Cave National Park
Distance: 6,595 km
Travel time: 14 days
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