The second park we visited on our RVenture was Mammoth Cave National Park. This is the world’s longest cave system with magnificent chambers and formations. We took a tour with a ranger and also went as far as we could into the original entrance.
Sadly, bats across the eastern U.S. are dying from white-nose syndrome and precautions are being taken to prevent humans from transporting it to other caves. We had to walk through a disinfectant upon leaving the cave.