William Howard Taft Bridge

From Wikipedia:

The William Howard Taft Bridge, or Taft Bridge, is a bridge in Washington, D.C., U.S.A. It carries Connecticut Avenue over Rock Creek Park. Its total length is 274.5 meters.

The bridge was built between 1897 and 1907 and was named after President William Howard Taft in 1931. It is an arch bridge with unreinforced concrete arches and a reinforced concrete deck. The designer was George S. Morison, and the architect was Edward Casey. It has been called an "engineering tour de force" as the largest unreinforced concrete structure in the world (at least as of 1996).

The bridge, besides being an icon of Washington, D.C., is known for its lion sculptures by Roland Hinton Perry and for its ornamental lampposts.

Also, some cool pictures at http://memory.loc.gov/cgi-bin/ampage?collId=hhphoto&action=browse&fileName=dc/dc0500/dc0594/photos/browse.db&recNum=0&itemLink=&linkText=-1&title2=Connecticut%20Avenue%20Bridge,%20Spans%20Rock%20Creek%20at%20Connecticut%20Av,%20Washington,%20DC&displayType=-1&maxCols=4.