The cave is named for the glittering calcite crystals found within its walls.
Boxwork, a rare honeycomb-like cave formation, is found here in greater abundance than in any other cave in the world.
The cave maintains a constant natural air pressure that causes it to 'breathe,' drawing air in or pushing it out depending on atmospheric pressure changes.
Exploration of the cave is ongoing, with volunteer cavers discovering new miles of passage annually.
The cave was designated a National Monument in 1908 to protect its unique geological features.
The temperature remains steady at 49 degrees Fahrenheit (9 degrees Celsius) regardless of the weather on the surface.
It is considered a 'dry' cave, meaning it lacks the large, flowing rivers found in many other major cave systems.
Jewel Cave National Monument contains the third-longest cave system in the world, with over 220 miles of mapped passages. The site is situated in the Black Hills of South Dakota and is managed by the National Park Service. Underground tours are the primary way to access the cave, showcasing calcite crystal linings, boxwork, and hydromagnesite balloons. The cave environment maintains a constant temperature of approximately 49 degrees Fahrenheit year-round. It is a dry cave system with limited active water flow, which contributes to the preservation of its delicate crystalline structures. Several tour routes vary in difficulty and duration, ranging from accessible walks to strenuous climbs. The monument surface area covers over 1,200 acres of ponderosa pine forest and limestone bluffs. Ongoing exploration continues to add to the total surveyed length of the subterranean corridors.
The surface scenic overlook near the visitor center provides panoramic views of the Black Hills landscape.
Book tour tickets online in advance as they frequently sell out during the peak summer season.
Wear a light jacket and closed-toe sturdy footwear, regardless of how hot it is outside.
Do not bring external clothing or gear into the cave that has been inside other caves to prevent the spread of white-nose syndrome among bats.
Attempting to visit without a pre-booked tour, as cave access is strictly limited to guided groups.
Tours are limited in winter months; visitor center operations may fluctuate based on seasonal staffing.
Do not touch the walls or crystals; stay with your guided tour group at all times.
