Manhattan Bridge, New York City. Spanning East River at Flatbush Avenue, with World Trade Center twin towers in background. This single span suspension bridge contains one of the longest suspension spans in the U.S., and had the largest carrying capacity in the country when it was built. It is unusual in that it was designed as a dual-level bridge; carrying street-cars on the upper level and subway tracks on the lower, with roadways in the center of each level. The approaches to the bridge were designed by Carrere and Hastings, and incorporated allegorical figures of Manhattan and Brooklyn by Daniel Chester French, which have since been removed to the Brooklyn Museum.