|  |  | Stunning Pic: Man Descending Into 1 Of World's Largest Caves photography.nationalgeographic.com — Located in Oman -- cave actually being explored as possible adventurer (tourist) destination. [Pic looks best enlarged.] Part of Nat Geo gallery with other striking photos including deepest cave in continental U.S., & cave in Mexico with 2nd deepest entrance in world...More... (General Sciences) Comments Email Added 2008-02-06 17:50:08 openthink