The Rockville Bridge, at the time of its completion in 1902, was the longest stone masonry arch railroad viaduct in the world. Constructed between 1900 - 1902 by the Pennsylvania Railroad, it has forty-eight 70-foot spans, for a total length of 3,820 feet (1,164 m).
In hindsight, I think the other side of the bridge may be more interesting. I'll have to check that out next time I'm in Central Pennsylvania.
This shot was made from three exposures, -2, 0, +2, merged in Photomatrix. I think added the texturing and border in Photoshop. I also toned down the colors to make it a bit less vibrant, which I think fits. A lot of the yellow/orange color your seeing actually comes from the texture layered over top of the shot.