American Cave Conservation Association - nonprofit organization formed for the purpose of protecting caves and karstlands. Site offers videos, photos, calendar, merchandise, and visitor information.
Careys Cave - Located in the Wee Jasper Valley. Site outlines how the caves were formed, tours, workshop details, and resources for schools.
Cave Conservancy of the Virginias - Dedicated to the preservation of topographical and biological environments in the Karst areas of Virginia and West Virginia.
Cavers Digest - Includes mailing list, archives, FAQ, and photos of Utah caves and diving.
Caves and Caving in the UK - Directory of spelunking resources including U.K. cave guides, caving organizations, clubs, and information on rescue, gear, and equipment.
Caves in the National Parks and Monuments - Provides highlights of various caves around the United States, including Carlsbad Caverns in New Mexico and Mammoth Caves in Kentucky.
Caves of the Virginias - Underground photographic tour of many of the caves in West Virginia and Virginia.
Caves.com - Provides articles, photo galleries, discussion groups, videos, and events for cave enthusists.
Caving Pages, The - For the caving enthusiasts. Information of caves with maps across the world, conservation, cave fragments, and photo gallery.
Caving.UK - Dedicated to cavers and caving. Includes a club directory, U.K. caving stores, photography, news, art, conservation, and more.
Crystal Caverns - Guides offer real facts about caverns in the Shenandoah Valley and the uniqueness of Crystal Caverns.
Desert Caves Project, The - Provides articles, travelogues, and photos about cave exploring in Saudi Arabia's Dahna Desert to inform people of the fragility and dangers of the underground caves.
Diamond Caverns - Offers year-round tours of this historical cave found in 1859.
Journey Into Amazing Caves - About water and karst, cave life and habitat, history of human use of caves.
Lincoln Caverns - Come explore where the splendor of nature's handiwork has been protected and preserved for your visit.
Mark Twain Cave - Offers guided tours, campground, and a gift shop.
Michigan Karst Conservancy - Includes current projects, membership information, and more about the Michigan Karst Conservancy.
Mid-Atlantic Karst Conservancy - Dedicated to "preserving the caves of today for the cavers of tomorrow." Site includes event calendar, news, membership information, and a list of caves in Pennsylvania.
Monongahela Grotto - North-central West Virginia chapter of the National Speological Society. Includes trip reports, calendar, and photo album.
MUSS Caving Club - Manchester based caving club with members around Europe. Site provides photo gallery, newsletters, message board, and meeting schedule.
Northeastern Cave Conservancy - Promotes the study and preservation of speleologically significant properties in the Northeastern United States. Site includes news, event calendar, and membership details.
Northern New Jersey Grotto - Official site for the northern New Jersey Grotto. Offers meeting schedule, events, photos, and caving links.
Perry's Cave - Natural limestone cave featuring tours, gift shop, and gemstone mining during the summer season.
Potomac Speleological Club - Dedicated to caving, conservation and the science of speleology in West Virginia. Site includes club news, membership details, and more.
San Francisco Bay Chapter - NSS - Newsletters, project info, trip reports, calendar of events, and other things of interest to bay area cavers.
Sea Lion Caves - Large sea caves where one can view sea lions in their native habitat.
Secret Caverns - Walking tours of the chambers, formations, and 100-foot underground waterfall.
Smoke Hole Caverns - Amazing formations and caverns located in the Spruce Knob-Seneca Rocks National Recreation Area, including lodging, an outfitting service, shopping and a museum.
Spelaeologia Croatica Journal - Annual journal edited by Croatian Speleological Association (HSD), Society for the Research and Surveying and Photographing of Karst Phenomena (DISKF). In Croatian.
Speleo-Art - An informal group of artists (based in the UK) with a particular interest in caves and speleology.
Texas Speleological Survey - Non-profit organization established in 1961 for maintaining information on Texas caves and karst. Site includes articles, event calendar, photo galleries, and maps.
U.S. Cavers Forum - Discussion forums about cave gear, trips, photography, cave conservation and speleology, and other information.
U.S. Show Caves Directory - Interactive guide to developed or show caves in the United States, also known as commercial caves.
Virtual Cave - Contains photos and information on solution, sea, lava tube, and erosional caves, as well as a directory of caves in the U.S.
Virtual Caving - Includes photos from caving trips, links, and surveys. Countries include Iran, Thailand, and Madagascar.
Western Australian Speleology - Includes caving areas, conservation information, photos, and links for the Western Australian Speleological Group.
Wikipedia: Caving - Encyclopedic article about caving. Includes cave naming issues, practice and equipment, safety, conservation, and caving organizations.
World Cave Database - Caves across the world sorted by depth, length, and country. Includes reference links.
