• Explore and Discover One of the Last Frontiers in the World ...

    Jewel Cave

    National Monument South Dakota

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  • Caution - Parking Lot at Jewel Cave is under construction

    The parking lot project is on schedule for completion this fall. There is limited RV parking. The stairs and wheelchair ramp to the visitor center are also under construction. Signage along a service road will help guide visitors to the visitor center. More »

Cave / Karst Systems

A caver in Jewel Cave (Marc Ohms Photo)

A cave explorer in an area known as "The Stratosphere," approximately 5 miles from the elevator entrance.

Marc Ohms photo

Jewel Cave National Monument is well-known for its spectacular and unusual cave and karst features. Since 1959, cavers have made a concerted effort to map Jewel Cave, and have discovered that it is among the longest cave systems in the world. Over 166 miles of interconnected passages have been discovered so far, and studies indicate that this represents only a fraction of what remains to be found.

Did You Know?

Large cave passage / Marc Ohms photo

The largest room discovered in Jewel Cave is called the Big Duh. It measures 570 feet long, is 180 feet wide at its widest point, and is 30 feet tall.