An aerial view of a lake with a large stone bridge visible just above the water level. The inset photo shows a closeup of two of the stone arches and the roadway, still intact.

Credit: Photo by Vince Ferrari

Completed as part of the National Road in 1818, the Great Crossings Bridge was submerged under water in the 1940s when the Youghiogheny River was dammed. When water levels are low, however, the bridge emerges, as shown in this photo taken in the fall of 2001. The inset photo shows the bridge is still surprisingly intact.