Dome

General view of entire bridge, from the east; The bridge crosses the Potomac River, connecting the Lincoln Memorial and Columbia Island. The northeastern end of the bridge marks the western edge of the National Mall. The southwestern end connects with Memorial Avenue, which crosses the Boundary Channel Bridge into Virginia and travels to Arlington National Cemetery in Arlington County. Although the Arlington Memorial Bridge was part of the 1901 McMillan Commission's plan for restoring Pierre Charles L'Enfant's original plan for the capital, two decades passed before construction was initiated. Except for the draw span (now inactive), the bridge is of reinforced concrete construction faced with dressed North Carolina granite ashlar. Source: Wikipedia; http://en.wikipedia.org/wiki/Main_Page (accessed 7/9/2010)