The Natural Bridge Caverns were discovered just before the turn of the 20th century and opened to the public in 1977. Visitors enjoying the Natural Bridge Caverns tour descend more than 34 stories deep within the Earth to get to the magnificent natural display. While underground, tourists can explore the Natural Bridge Caverns and view their many special features, including cavern structures such as the Colossal Dome room. This room is anenormous dome shaped natural feature that was created over thousands of years. Walking from the dome room, visitors can also see other places while on the 45 minute tour of the Natural Bridge Caverns; be sure to see things like Mirror Lake, the Well Room and the stalactites and stalagmites that grow from the Canyon Room.