» 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

» 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

» 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

» 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

» 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/

» 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/

» 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