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.
Read more about Jewel Cave National Monument: History, Exploration, Hydrogeology, Visitation
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—Henry David Thoreau (1817–1862)