More of a skyscape with the Lupu Bridge....
Technicalities: this photo is SOOTC - Straight Out Of The Camera. No PP. Colours are due to the the use of a Cokin no. 197 "Grad Sunset" filter and setting the camera WB to "Shadow" while shooting. See here where this picture was taken. [?]
With an arch span of 550m Shanghai's Lupu Bridge (卢浦大桥) has been the longest steel arch bridge in the world until it was surpassed by the Chaotianmen Bridge.
The Lupu Bridge spans the Huangpu River from the Luwan District to Pudong. It's located at the northern edge of the EXPO 2010 area and did provide a great overview over the EXPO. One may ascend the bridge for a fee, an observation platform is located at the top of the arch. Carrying tripods is prohibited.
Other steel arch bridges' arch span:
Chaotianmen Bridge, Chongqing 552m (the new no. 1)
New River Gorge Bridge, West Virginia, 521m
Bayonne Bridge, New Jersey, 510m
Sydney Harbour Bridge 503m
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