Mammoth Cave has over 390 miles of passageways. Mammoth Cave National park covers 52,385 acres. Mammoth Cave was once used as a tuberculosis hospital. Mammoth Cave receives over 500,000 visitors each year.
The Mammoth Cave System, at 367 miles in Kentucky takes the prize. ---- Mammoth Cave System is also on the Mammoth Cave National Park located in Edmonson, Hart, and Barren Counties. The Park is 52,835 acres big that is (214 km power 2) The Mammoth Cave System was Established in July 1, 1941.