Each year at the annual NSS convention, cavers submit photos and videos for judging and display. If you shoot photos or videos in caves, consider entering one or more of the following salons. It's fun!
Photographic print salon http://caves.org/committee/salons/Print.shtml
Photographic slide (projected image) salon http://caves.org/committee/salons/Slide.shtml
Video salon http://caves.org/committee/salons/Video.shtml