When the bridge opened in 1926, its 1,750-foot main span made it the longest suspension bridge in the world. Paul Cret, architect of the Rodin Museum, was the designer. The bridge has been having some rust problems of late, but a massive, multiyear project has restored its glorious blue paint job. The bridge is most impressive when it's lighted at night. Start the 1¾-mi walk (one way) from either the Philadelphia side, two blocks north of the U.S. Mint, or the Camden, New Jersey, side.