Wind Cave box work formations. Copyright © Clinton Little. Image used under Creative Commons 2.0 License.

Wind Cave National Park in western South Dakota was 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 (most passage volume per cubic mile) cave system in the world.  The cave is currently the fifth-longest in the world with 136.55 miles of explored cave passageways, with an average of four new miles of cave being discovered each year.  Above ground, the park includes the largest remaining natural mixed-grass prairie in the United States.  (Source: Wikipedia, Image: Clinton Little)

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