Credit: The Carnegie Library of Pittsburgh
In the 1846 John Roebling used his wire rope to rebuild the wooden Monongahela Bridge, which had burned down the year before. Roebling moved his family from Pittsburgh to Trenton, N.J., in 1849, but he returned to the city in the late 1850s to build the magnificent Sixth Street Bridge, which was replaced by the Roberto Clemente Bridge in 1928.
