Jewel Cave National Monument

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11149 US Highway 16, Bldg. B12
Custer, SD 57730
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The third longest cave in the world features a variety of cave tours below the surface and a 1,279-acre park with nature trails above ground.

With a name derived from the crystals that line its walls, Jewel Cave is even more significant as the third-longest cave in the world. This national monument features a variety of cave tours below ground and a 1,279-acre park with nature trails above ground.

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