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.

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.

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.

Features 45-minute guided tour and 4-6 hour wild cave trips. Includes hours and fees. Located in Sequoia National Park.

Features combination boat and bus ride to the entrance. Includes photos of formations, history, direction map, hours, area activities and contact information. Gift shop and gem mining on premises. Located in O'Brien.

Offers 45-minute guided tour. Includes photo gallery, history, maps, admission fees, discount coupon, hours, links and contact information. Located near Murphys.

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.

Includes Mitchell Caverns Natural Preserve. Guided tour lasts 1-1/2 hours. Includes admission fees and schedule. Camping is available in the area. Located in Essex.