Pennsylvania Avenue National Historic Site

Pennsylvania Avenue National Historic Site
Pennsylvania Avenue N.W. in 2006: Freedom Plaza and its marble inlay of the L'Enfant Plan's 1791 street-grid diagram of Washington, D.C., visible on pavement (foreground), 1111 Pennsylvania Avenue (on left behind trees), Old Post Office Pavilion (on right), and the United States Capitol (background)
Location	Washington, D.C., U.S.
Coordinates	38°53′37″N 77°01′26″W / 38.89361°N 77.02389°W / 38.89361; -77.02389
Area	20.6 acres (8.3 ha)[1]
Established	September 30, 1965[2]
Governing body	National Park Service, U.S. Dept. of the Interior
Website	Pennsylvania Avenue National Historic Site
Pennsylvania Avenue National Historic Site
U.S. National Register of Historic Places
NRHP reference No.	66000865
Added to NRHP	October 15, 1966 [3][4]

Pennsylvania Avenue National Historic Site is a National Historic Site in the city of Washington, D.C. Established on September 30, 1965, the site is roughly bounded by Constitution Avenue, 15th Street NW, F Street NW, and 3rd Street NW. The historic district includes a number of culturally, aesthetically, and historically significant structures and places, including Pennsylvania Avenue NW from the White House to the United States Capitol, the Treasury Building, Freedom Plaza, Federal Triangle, Ford's Theatre, the Old Patent Office Building, the Old Pension Office Building, which now houses the National Building Museum, Judiciary Square, and the Peace Monument.

Pennsylvania Avenue, the heart of the historic site, is sometimes called, "America's Main Street", and the avenue plays a significant part in American political culture. A march or event held on the avenue is infused with a great deal of political meaning.