See this gallery of caverns, cave picturess and canyons. Also, don't miss this BetterPhoto article on digital exposure camera techniques.
Antelope Canyon
© Tim PoitevinWaimea canyon, kauai 7083
© Kathleen T. CarrAntelope Canyon
© Lana ArcemontDawn in the Grand Canyon
© Kathy UrbachCave at Hug Bay - EP
© Thomas E. DillonStrange Formation
© Ken Jarvis