The historical significance of California Caverns is well established as a major cavern system and as one of the earliest officially recorded caves (1850) in the Mother Lode region of California. The early commercial enterprise associated with California Caverns is evidenced by the historical documents verifying organized tourist activities as early as 1854. Although one of numerous caves in the Mother Lode region, California Caverns claims the distinction of having the most extensive system of caverns and passageways.

Citation from California Office of Historic Preservation