With more than 150 documented paranormal events, many of them experienced by credible witnesses such as rangers and scientists, Mammoth Cave National Park easily qualifies for the title “most haunted natural wonder in the world.” Park rangers Colleen O’Connor Olson and Charles Hanion have recorded many of the park’s creepiest tales in their book Scary Stories of Mammoth Cave, a must read for anybody intrigued by the park’s supernatural history.