Jewel Cave
National Monument

Jewel Cave National Monument contains Jewel Cave, currently the third longest cave in the world, with 181.89 miles (292.72 kilometers) of mapped passageways. It is located approximately 13 mi (21 km) west of the town of Custer in South Dakota's Black Hills. It became a national monument in 1908.
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World's 3rd Longest Known Cave at 195+ Miles Mapped
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