See this gallery of caverns, cave picturess and canyons. Also, don't miss this BetterPhoto article on digital exposure camera techniques.
Winding Canyon
© Paul CocoLift to Guano Mine
© Glenn TortoriciFall in Canyon De Chelly
© JudyAnn RectorAntelope Canyon
© Lana ArcemontDawn in the Grand Canyon
© Kathy UrbachWaimea canyon, kauai 7083
© Kathleen T. CarrStrange Formation
© Ken JarvisCave at Hug Bay - EP
© Thomas E. DillonSlot Canyon Texture
© Gary R. Smith