The first cave to be designated a national park, Wind Cave features the world’s largest concentration of rare boxwork formations along with a 28,295-acre wildlife sanctuary on the surface. More than 140 miles of passages have been mapped making it the third longest cave in the U.S. and the sixth longest cave in the world.
https://www.nps.gov/wica/index.htm
26611 US-385, Hot Springs, SD 57747
