The Virtual Cave
- A wide-ranging introduction to the geology of caves. Organised by geological feature with pictures and clickable virtual maps.
Bill Storage - Speleology
- Photographs and articles dealing with speleology and cave exploration.
California Underground Online Exhibits
- An overview of the formation of caves, cave conservation, photography and wildlife together with local educational resources. Diagrams, pictures and slide shows.
Cavechat.org
- NSS discussion forum for US cavers including sections for cave diving, news, conservation, equipment, photography, rescue and surveying.
U.S. Cavers Forum
- Discussion forums including caving, the NSS, the study of speleology, cave conservation and management, bats and gear.
UIS International Speleo Calendar
- Events around the world.
World Cave Database
- A list of long and deep caves from all around the world. Listed by depth, length and country.