<Tr> <Td> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> </Td> </Tr> <Ul> <Li> </Li> <Li> </Li> <Li> </Li> </Ul> <P> Wind Cave National Park is an American national park located 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 notable for its displays of the calcite formation known as boxwork . Approximately 95 percent of the world's discovered boxwork formations are found in Wind Cave . Wind Cave is also known for its frostwork . The cave is also considered a three - dimensional maze cave, recognized as the densest (greatest 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 . Above ground, the park includes the largest remaining natural mixed - grass prairie in the United States . </P> <P> The Lakota, Cheyenne, and other Native American tribes who traveled through the area were aware of the cave's existence, as were early Euro - American settlers, but there has been no evidence yet discovered that anyone actually entered it . </P>

When did wind cave became a national park
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