Jewel Cave National Monument Photos

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Jewel Cave National Monument contains Jewel Cave, currently the second longest cave in the World, with just over 157 miles (253 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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Spar Crystals In The Jewel Cave

Calcite Crystals In Jewel Cave