I was surprised to find Wind Cave National Park on my little tourist map. I had never heard of it. I was excited to tour another cave. This one featured descending 300 stairs. Luckily my knees held out.
In 1903 Wind Cave was designated a national park by President Theodore Roosevelt, it was the 7th national park and the 1st cave to be designated a national park anywhere in the world. The cave is notable for its calcite formations known as boxwork, as well as its frostwork. Approximately 95 percent of the world’s discovered boxwork formations are found in Wind Cave. The cave is recognized as the densest cave system in the world, with the greatest passage volume per cubic mile. Wind Cave is one of the longest caves in the world with 149 miles (240 km) of explored cave passageways, as of 2018. Above ground, the park includes the largest remaining natural mixed-grass prairie in the United States.