July 9th, 2016 – Wind Cave National Park – Custer, South Dakota

Wind Cave National Park 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.   It is notable for its displays of the calcite formation known as box work (5th picture).   Approximately 95 percent of the world’s discovered boxwork formations are found in Wind Cave.   The cave is also considered a three-dimensional maze cave, recognized as the densest cave system in the world.   It is currently the sixth-longest in the world with 140 miles of explored cave passageways, with an average of four new miles of cave being discovered each year.

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