Wind Cave National Park
National park in South Dakota, United States
Wind Cave National Park is a national park of the United States located 10 miles (16 km) north of the town of Hot Springs in western South Dakota. Established on January 3, 1903 by President Theodore Roosevelt, it was the sixth national park in the U.S. and the first cave to be designated a national park anywhere in the world. The cave has calcite formations known as boxwork, as well as frostwork.
From Wikipedia, under CC BY-SA. More on occurri.