Bulfinch Gate House
Erected about 1828 under direction of Charles Bulfinch, Architect of the Capitol, this gate house stood until 1874 with another (now at 17th and Constitution Avenue) at the west entrance to the Capitol Grounds
Marker is at the intersection of 15th Street and Constitution Avenue, NW (U.S. 50), on the right when traveling south on 15th Street.
Courtesy hmdb.org