Mammoth Cave Visitor Center, Mammoth Cave National Park, Kentucky, USA 

More than 400 miles of Mammoth Cave have been explored, and the labyrinth boasts the title of world’s longest cave system. The best way to see it is on the three-mile Violet City Lantern Tour (tickets are required to enter the cave), where you’ll re-create the experience of bygone explorers by walking with only the light from a lantern as a guide.

Epic Best Hikes USA National Parks Culture & Adventure Route © Monika Newbound

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