![Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870221.mklzLdwA.jpg) Heritage Trail, Mammoth Cave National Park, Kentucky |
![Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870232.O9d4CedA.jpg) Heritage Trail, Mammoth Cave National Park, Kentucky |
![Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870250.oKVORmdX.jpg) Heritage Trail, Mammoth Cave National Park, Kentucky |
![Sunset Point, Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870256.0CusyHbo.jpg) Sunset Point, Heritage Trail, Mammoth Cave National Park, Kentucky |
![Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870257.H7zPQBz9.jpg) Heritage Trail, Mammoth Cave National Park, Kentucky |
![Squirrel, Heritage Trail, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870258.mSf3LL4g.jpg) Squirrel, Heritage Trail, Mammoth Cave National Park, Kentucky |
![Visitor Center, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870259.LdYEy631.jpg) Visitor Center, Mammoth Cave National Park, Kentucky |
![Dramatic lights, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870260.1sMB1Cvn.jpg) Dramatic lights, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Bottomless pit, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870211.YnrVIqoI.jpg) Bottomless pit, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Underground passageways, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870212.nFwuzLfa.jpg) Underground passageways, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Cavernous rooms, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870213.93gtSxBY.jpg) Cavernous rooms, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Water source, the process continues, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870214.e6jTAjQ8.jpg) Water source, the process continues, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Jabba the Hut, Calcite formation, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870215.wr9HlJE1.jpg) Jabba the Hut, Calcite formation, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Frozen Niagara, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870216.HZBgqFQJ.jpg) Frozen Niagara, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Shadows, Stalactite and Stalagmite formations, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870217.TqzNIV9M.jpg) Shadows, Stalactite and Stalagmite formations, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Calcite Formations, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870218.lx9nASzc.jpg) Calcite Formations, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Drapery room stalagmite, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870219.eoFwTu91.jpg) Drapery room stalagmite, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Frozen Niagara, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870220.9JZvj1RB.jpg) Frozen Niagara, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![New stalagmites forming, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870222.ikIqwAOD.jpg) New stalagmites forming, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Frozen Niagara calcite formation, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870223.8acRcipo.jpg) Frozen Niagara calcite formation, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Down to the water, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870224.bgilwJEO.jpg) Down to the water, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Stalctites, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870225.f2LLhP0R.jpg) Stalctites, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Stalactites, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870226.AvOHmIew.jpg) Stalactites, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Cave cricket, New Entrance Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870227.4drDOTqo.jpg) Cave cricket, New Entrance Tour, Mammoth Cave National Park, Kentucky |
![Propane powered bus, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870228.FEn1YGhb.jpg) Propane powered bus, Mammoth Cave National Park, Kentucky |
![Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870229.bWazdlEI.jpg) Mammoth Cave National Park, Kentucky |
![Bridge to the Visitor Center, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870230.M6os1XH8.jpg) Bridge to the Visitor Center, Mammoth Cave National Park, Kentucky |
![Butterfly breeding, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870231.pIX3Vol4.jpg) Butterfly breeding, Mammoth Cave National Park, Kentucky |
![Twilight, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870233.vFThQPpr.jpg) Twilight, Mammoth Cave National Park, Kentucky |
![Twilight, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870235.jnZAhcvQ.jpg) Twilight, Mammoth Cave National Park, Kentucky |
![Twilight, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870237.3zFtiitt.jpg) Twilight, Mammoth Cave National Park, Kentucky |
![Historic Entrance, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870239.7E2uuYmx.jpg) Historic Entrance, Mammoth Cave National Park, Kentucky |
![Water curtain, Historic Entrance, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870241.NoSeq1qU.jpg) Water curtain, Historic Entrance, Mammoth Cave National Park, Kentucky |
![Rotunda room, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870243.wcbzQLlT.jpg) Rotunda room, Historic tour, Mammoth Cave National Park, Kentucky |
![Ghost who walks, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870245.0J7oQ4qe.jpg) Ghost who walks, Historic tour, Mammoth Cave National Park, Kentucky |
![Cavernous rooms, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870247.JPiuSrFL.jpg) Cavernous rooms, Historic tour, Mammoth Cave National Park, Kentucky |
![Horizon cave, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870248.KSFW0bIa.jpg) Horizon cave, Historic tour, Mammoth Cave National Park, Kentucky |
![Fat Man's Misery, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870249.lze0Mtvq.jpg) Fat Man's Misery, Historic tour, Mammoth Cave National Park, Kentucky |
![Passageway, Historic Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870251.sLfBiLrg.jpg) Passageway, Historic Tour, Mammoth Cave National Park, Kentucky |
![192 foot room, Historic tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870253.f0RnThSq.jpg) 192 foot room, Historic tour, Mammoth Cave National Park, Kentucky |
![Passageway, Historic Tour, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870254.fdeIX6L0.jpg) Passageway, Historic Tour, Mammoth Cave National Park, Kentucky |
![Historic Entrance, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870255.XXmiBINH.jpg) Historic Entrance, Mammoth Cave National Park, Kentucky |
![Exploring, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150903189.1AarPfQ3.jpg) Exploring, Mammoth Cave National Park, Kentucky |
![Turkey run, Mammoth Cave National Park, Kentucky](https://a4.pbase.com/g9/30/52730/3/150870210.nz5Dxbx3.jpg) Turkey run, Mammoth Cave National Park, Kentucky |