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Going Underground: 10 Caves and Caverns to Explore in America

Condé Nast Traveler Logo By Lauren Kilberg of Condé Nast Traveler | Slide 1 of 10: <p>Custer, South Dakota</p><p> With more than 170 miles of explored passageways, this cave ranks third longest in the world. Since 1908 <a href="http://www.nps.gov/jeca/index.htm">Jewel Cave</a> has been designated a national monument. The year-round Wild Caving Tour ($31 for adults, no children under 16) is one of three guided tours offered. It takes you on a three-to-four-hour adventure that will have you scaling rocks via ropes and crawling your way through nearly a mile of this massive unground system. While touring you'll also peer into ominous fissures, pass giant boulders, and spot strands of gypsum in the presence of the nine bat species that call the cave home during the winter months. </p>

Jewel Cave, Custer, South Dakota

With more than 170 miles of explored passageways, this cave ranks third longest in the world. Since 1908 Jewel Cave has been designated a national monument. The year-round Wild Caving Tour ($31 for adults, no children under 16) is one of three guided tours offered. It takes you on a three-to-four-hour adventure that will have you scaling rocks via ropes and crawling your way through nearly a mile of this massive unground system. While touring you'll also peer into ominous fissures, pass giant boulders, and spot strands of gypsum in the presence of the nine bat species that call the cave home during the winter months.

© Clint Farlinger / Alamy

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