Taking a trip to Wind Cave National Park, in the southwestern corner of South Dakota, is somewhat like traveling back in time to the frontier days – when the plains were endless and bison still roamed. Wind Cave also features one of the world’s longest and complex caves. The cave is particularly noted for its unusual boxwork displays – strange formations of calcite fins that look just like honeycombs. Wind Cave National Park was established by president Theodore Roosevelt in 1904, making it the 7th oldest national park, and the first cave in the world to receive such as a designation. Above ground, the park contains the largest remaining mixed-grass prairie in the United States.