Wind Cave National Park is a United States national park 10 miles (16 km) north of the town of Hot Springs in western South Dakota. Established in 1903 by President Theodore Roosevelt, it was the seventh U.S. National Park and the first cave to be designated a national park anywhere in the world.
The cave is also considered a three-dimensional maze cave, recognized as the densest (most passage volume per cubic mile) cave system in the world. The cave is currently the sixth-longest in the world with 140.47 miles (226.06 km) of explored cave passageways, with an average of four new miles of cave being discovered each year.
A short demonstration on why the Wind Cave was given it's name. Because of the high pressure inside the cave and the low pressure outside the cave, the air flows out.
The cave is notable for its displays of the calcite formation known as "box work". Approximately 95 percent of the world's discovered box work formations are found in Wind Cave.
Wind Cave is also known for its "frost work".
Above ground, the park includes the largest remaining natural mixed-grass prairie in the United States.
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