A hidden world beneath the prairie Bison, elk, and other wildlife roam the rolling prairie grasslands and forested hillsides of one of America’s oldest national parks. One of the longest and most complex caves in the world, named for barometric winds at its entrance, this maze of passages is home to boxwork, a unique formation rarely found elsewhere.

Phone: 605-745-4600

Address: 26611 US Hwy 385, Hot Springs, SD 57747

Website: http://www.nps.gov/wica/index.html