Mammoth Cave

Longest Cave

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U.S. Postal Commemorative, Jefferson National Expansion Memorial

St. Louis, Missouri

More than 365 miles of passages have been explored and mapped in Mammoth Cave, in Kentucky.¬† This is the longest known cave in the world; according to tradition, it was discovered in the 1790’s by a hunter chasing a bear.

http://www.nps.gov/maca/index.htm

http://en.wikipedia.org/wiki/Mammoth_Cave_National_Park

Wonders of America: Land of Superlatives Stamp Series@2005 United States Postal Service. All rights reserved. Used with Permission.

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Image courtesy of Jim Roberts, GVCC