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The Commonwealth of Virginia acquired the tunnel and 100 surrounding acres in 1967 from the Natural Tunnel Chasm and Caverns Corp. to establish Natural Tunnel State Park. Approximately 750 additional acres were later acquired and the park opened in 1971. Natural Tunnel, called the Eighth Wonder of the World by William Jennings Bryan, has been attracting sightseers to the mountains of southwestern Virginia for more than 100 years. Today it is the focal point of Natural Tunnel State Park, a park which offers visitors not only spectacular sights but also swimming, camping, picnicking, hiking, a visitor center, an amphitheater and interpretive programs. The creation of Natural Tunnel began more than a million years ago in the early glacial period when groundwater bearing carbonic acid percolated through crevices and slowly dissolved surrounding limestone and dolomite bedrock. Then, what is now Stock Creek was probably diverted underground to continue carving the tunnel slowly over many centuries. The walls of the tunnel show evidence of prehistoric life, and many fossils can be found in the creek bed and on tunnel walls.
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