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U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
An interpretive sign on the hiking trail to the Natural Bridge explains how the hidden river vanishes into the lava tube for 200 feet, forming the natural bridge.
Public Domain. Photo by A. E. Crane
Download Original (2256 x 1496 pixels, 444.6 KB)
