Texas: Natural Bridge Caverns

The Natural Bridge Caverns are the largest known commercial caverns in the U.S. state of Texas.The name[1] was derived from the 60 ft natural limestone slab bridge that spans the amphitheater setting of the cavern’s entrance. The span was left suspended when a sinkhole collapsed below it. The caverns were discovered on March 27, 1960. (Wikipedia)

http://www.naturalbridgecaverns.com/

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