- September 2005
Region: Rocky Mountain Region
Location: Hot Springs, SD
Link: NPS website
Passport Description: Once of the world's longest and most complex caves and 28,295 acres of mixed-grass prairie, ponderosa pine forest, and associated wildlife are the main features of the park. The cave is well know for its outstanding display of boxwork, an unusual cave formation composed of thin calcite fins resembling honeycomb.
Official Passport Stamp:
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