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National Park ServiceCave pearls, polished by dripping water (NPS Photo)
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Caver standing in a cave passage / Marc Ohms photo  

Did You Know?
Jewel Cave is the second longest cave in the world, with over 140 miles of mapped passages. On average, volunteer cavers discover and map over 3 miles of passages in Jewel Cave every year!

Last Updated: July 25, 2006 at 00:22 EST