See this gallery of caverns, cave picturess and canyons. Also, don't miss this BetterPhoto article on digital exposure camera techniques.
Antelope Canyon
© Ravi NoriBryce
© Patricia A. StalterRafting the Canyon panorama
© Stephen A. LivermanBrice Canyon, Utah
© John C. EnsignArizona Sandfalls
© Kathleen E. Wasselle CroftAncient Sites
© Daniel Schual-Berke