  |
Lake Shasta Caverns - http://www.lakeshastacaverns.com/
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. |
| |
Crystal Cave - http://www.sequoiahistory.org/cave/cave.htm
Features 45-minute guided tour and 4-6 hour wild cave trips. Includes hours and fees. Located in Sequoia National Park. |
| |
Moaning Cavern - http://www.caverntours.com/MoCavRt.htm
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. |
| |
Mercer Caverns - http://www.mercercaverns.com/
Offers 45-minute guided tour. Includes photo gallery, history, maps, admission fees, discount coupon, hours, links and contact information. Located near Murphys. |
| |
Black Chasm Cavern - http://www.caverntours.com/BlackRt.htm
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. |