Ninety miles of underground passageways have been mapped to date. but many more miles are left to be discovered. The cave takes its name from glittering Jewellike calcite crystals which line the walls of many of the caves rooms and tunnels. Finally. there is Mount Rushmore. set in the heart of the Black Hills National Forest. The Mount Rushmore National Memorial attracts more than 2 million visitors each year. It is truly Americas Shrine of Democracy. The monument was designed in 1927 by Gutzon Borglum. the son of Danish immigrants. The Memorial is a shrine of American Presidential heroes: George Washington. father of the Nation. Thomas Jefferson. author of the Declaration of Independence.
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