Natural Bridge Caverns - largest known commercial caverns in Texas

Natural Bridge Caverns, located north of San Antonio, are described by operators and multiple sources as the largest known commercial caverns in Texas. The cave system was discovered in 1960 and opened for public guided tours in 1964; it features large stalagmites, flowstone, and cavern rooms marketed as some of the most extensive publicly accessible formations in the state. The site also offers above-ground attractions such as zip lines and gem mining tied to its tourism operations.