with almost 400 miles of tunnel – mammoth cave in kentucky is the longest cave system in the world.  gorgeous, haunting and awe-inspiring.  we had an excellent tour guide for our 2 1/2 hour venture through one area of the caves.  was not equipped for capturing decent photos, however, so just a few shots here.

cave entrance ‘rotunda’

years old graffiti

one of the natural entrances to mammoth cave