OVERNIGHT TRIP FROM EMERALD COAST! Bought in 1993 by our current owners, this natural wonder has been transformed from a simple scuba diving site to a world class tourist attraction. Visit one of North America's most prehistoric places, Devil's Den Spring! This underground spring inside a dry cave has been home to many extinct animal fossils dating back to the Pleistocene Age, which are on display at The University of Florida's Museum of Natural History.