A layer of mist hangs over a small tour group gathered at the Historic Entrance of Mammoth Cave on a summer day - it both delights the skin and fogs spectacles, and gives a sense that one is on the threshold of another world.
Photo Credit: NPS Photo
Photo of Mammoth Cave National Park
Mammoth Cave National Park
1 Visitor Center Parkway, Mammoth Cave, Kentucky 42259-0007 USA