In 1976, the National Park Service added the Capitol Hill Historic District to the National Register of Historic Places. It is one of the largest historic districts in the United States. The boundaries of the historic district are irregular, extending southward from F Street NE, as far east as 14th Street, as far west as South Capitol Street, and with a southern limit marked chiefly by Virginia Avenue but including some territory as far south as M Street SE. It includes buildings from the Federal period (1800 to 1820) through 1919, but most of the buildings are late Victorian.