Jewel Cave National Monument
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Jewel Cave National Monument contains Jewel Cave, currently the fifth longest cave in the world and second longest cave in the United States, with 220.33 miles of mapped passageways as of July 2025. I
The Inner Sanctum, one of the longest and largest passageways along the Scenic Tour
A mid-century visitor to Jewel Cave
Jan Conn exploring Jewel Cave in 1959
Jewel Cave National Monument's main visitor center complex
Boxwork
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In geology, boxwork is defined as a honeycomb-like structure that can form in some fractured or jointed sedimentary rocks. If the fractures in the host rock are mineralized, they can become more resis
Boxwork in Wind Cave, South Dakota
Large boxwork ("cratework") in Wind Cave.
Boxwork removed from Wind Cave.