Wind Cave National Park
Wind Cave National Park is an unobtrusive yet interesting place. Established in 1903 by President Theodore Roosevelt, it was the seventh national park and the first cave to be designated a national park anywhere in the world. The cave is notable for its calcite formations known as boxwork. About 95 percent of the world's discovered boxwork formations are found here. Wind Cave is one of the longest caves in the world with nearly 150 miles of explored cave passageways. Above ground, the park includes the largest remaining natural mixed-grass prairie in the United States.
It's also a tough place for us amateurs to get interesting photographs.