Devil's Den Cave

Devil's Den is formed by a karst window, in which the roof over a subterranean river has collapsed, exposing the water to the open surface, near Williston, Florida.

In cold weather, water vapor rising from the surface of the river forms a visible plume above the entrance to the cave, which suggested a chimney from Hell to early settlers.

The opening to the surface was originally a small solution sinkhole, through which visitors had to squeeze to reach the water.

The passage called chamber 3, 70 feet (21 m) under water, contained animal and human remains and artifacts.

The animal remains, which appeared to be associated with the human remains and artifacts, were from extinct (Pleistocene) species, including mastodons, ground sloths, camels, horses, dire wolves, bog lemmings, Florida spectacled bears, saber-toothed cats, and peccaries.