United States California Volcano
Black Chasm Cavern National Natural Landmark
A National Natural Landmark featuring a striking marble cave with rare helictite formations, tourable by visitors interested in geology.
- 15701 Pioneer Volcano Road
- (888) 488-1960
- http://cavetouring.com/
Black Chasm Cavern National Natural Landmark Guides
Amazing Caves in Northern California
michele (Michele Humeston) The Mother Lode area has some of California’s largest cavern systems. Professional tours of these natural wonders are fun, easy to access and educational for the entire family.