Lake Shasta Caverns
- Features combination boat and bus ride to the entrance. Includes photographs of formations, history, direction map, hours and area activities. Gift shop and gem mining on premises. Located in O'Brien.
- http://www.lakeshastacaverns.com/

California Cavern - State Historic Landmark
- First cave in the state to be opened to the public for guided tours. Includes descriptions of walking tours and expeditions available, lists other activities, prices, and a map and directions to location east of Mountain Ranch.
- http://www.caverntours.com/CalifRt.htm

Boyden Cavern
- Offers 45-minute guided tour. Includes hours, fees, discount coupon, classroom program, FAQs and contacts. Gift shop and picnic area on premises. Located in Kings River Canyon of Sequoia National Park.
- http://caverntours.com/BoydenRt.htm

Black Chasm Cavern
- Designated a National Natural Landmark in 1976, features a fifty-minute tour to view rare helictite formations. Includes hours, tour prices, map and direction to location in Volcano, California.
- http://www.caverntours.com/BlackRt.htm

Moaning Cavern
- Discover California's largest single vertical chamber in a public cavern. Describes family and adventure tours available, hours, other activities, prices, and map and directions to location near Vallecito.
- http://www.caverntours.com/MoCavRt.htm

Crystal Cave
- Features 45-minute guided tour and 4-6 hour wild cave trips. Includes hours and fees. Located in Sequoia National Park.
- http://www.sequoiahistory.org/cave/cave.htm

Mercer Caverns
- Offers 45-minute guided tour. Includes photo gallery, history, maps, admission fees, discount coupon, hours, links and contact information. Located near Murphys.
- http://www.mercercaverns.com/