Devil's Den is a prehistoric spring that has previously uncovered many ancient fossils from the Pleistocene epoch. Many of these Fossils can now be found at the University of Florida's Museum of Natural History. After the owners bought the place in 1993, they turned this cavern into one of Florida's most popular sites for snorkeling and scuba diving. Visitors can spend the night by lodging in one of the many comfortable cabins or by setting up a tent on property grounds. There are also designated areas for those who wish to bring their RV's.