Jewel Cave National Monument

Jewel Cave National Monument

11149 US Hwy 16 Bldg B12, Custer, SD 57730
605-673-8300
www.nps.gov/jeca

At 142 miles, Jewel Cave is the second longest cave in the world. It is filled with calcite crystals and other wonders that make up the "jewels" of Jewel Cave National Monument. The current length of Jewel Cave is: 142.06 miles. On April 12, 2008 explorers spent 11.5 hours underground and mapped 694.75 feet of cave passages.

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