Constitution Avenue is a major east–west street in the northwest and northeast quadrants of the city of Washington, D.C., in the United States. It was originally known as B Street, and its western section was greatly lengthened and widened between 1925 and 1933. It received its current name on February 26, 1931, though it was almost named Jefferson Avenue in honor of Thomas Jefferson. Constitution Avenue's western half defines the northern border of the National Mall and extends from the United States Capitol to the Theodore Roosevelt Bridge. Its eastern half runs through the neighborhoods of Capitol Hill and Kingman Park before it terminates at Robert F. Kennedy Memorial Stadium. Many federal departmental headquarters, memorials, and museums line Constitution Avenue's western segment.