I highly recommend a visit to Mammoth Cave to anyone, as it is a true natural wonder, the largest cave of its type in the world. Once an underground river, there are places where the ceiling, remarkably smooth for a cave system, reaches seventy or more feet overhead. It is so big that church services and theatrical performances have been held in it, and there was once a hospital colony for tuberculosis patients, the first in the country, in fact, housed there. At least five patients died there during the experiment in the 1840s, wherein they lived underground believing the cave air would cure them. I asked one of the guides during my recent visit if the cave was haunted. She checked to make sure that no one else was around—I got the feeling they are discouraged from talking about such things “on the record”—then proceeded to tell me about the frequency of women guides feeling something unseen running fingers through their hair, hearing whispers when there was no one around, and the sound of coughing coming from places in the cave off-limits to both employees and guests. In other words, yes, there are ghosts there.
There are bats, too, though you seldom are lucky enough to see them, I was told. I got lucky and saw some sleeping far overhead. Also of note to the morbidly-minded is the Giants Coffin, an enormous fallen boulder that sure looks like a huge coffin. Can you imagine the vampire that would reside inside one that big!