See this gallery of caverns, cave picturess and canyons. Also, don't miss this BetterPhoto article on digital exposure camera techniques.
Lift to Guano Mine
© Glenn TortoriciFall in Canyon De Chelly
© JudyAnn RectorOn Golden Shores
© Julianne BradfordWaimea canyon, kauai 7083
© Kathleen T. CarrAntelope Canyon
© Lana ArcemontStrange Formation
© Ken JarvisCave at Hug Bay - EP
© Thomas E. DillonSlot Canyon Texture
© Gary R. SmithPindaya Limestone Cave
© Ye Tun