See this gallery of caverns, cave picturess and canyons. Also, don't miss this BetterPhoto article on digital exposure camera techniques.
Pindaya Limestone Cave
© Ye TunEntrance to the Labyrinth
© MARLON IGNACIOhanging ghost
© Larry A. CameronDesert Shade - EP
© Thomas E. DillonAntelope Canyon
© MARLON IGNACIOLa Jolla Cove
© Julianne Bradford