Painted Cave on Santa Cruz Island
Painted Cave grotto on Santa Cruz Island in the Channel Islands, near Santa Barbara, CA on a tour on the boat Condor Express 07 Sept. 2008.
Some say this long deep dark cave is in fact an entrance to Hell.
Scale note: the main entrance here is about 15 feet wide.
Update July 2009 - see a set of images taken by kayak inside Painted Cave!
02 Dec 2009 Creative Commons derivative art use at Deviant Art