Jewel Cave National Monument
- Address: 11149 Mt Rushmore Rd (US 16 B-12)
- US County of Custer County in South Dakota
- As Noted In: US National Monument, US National Park Service
Explore and Discover One of the Last Frontiers in the World
Immerse yourself within the third longest cave in the world. With over 168 miles of mapped and surveyed passages, this underground wilderness appeals to human curiosity. Its splendor is revealed through fragile formations and glimpses of brilliant color. Its maze of passages lure explorers, and its scientific wealth remains a mystery. This resource is truly a jewel in the National Park Service. - NPS