1917. "District of Columbia traffic. Stop and Go signs." A very new-looking Haynes roadster in Washington crossing Pennsylvania Avenue at 14th Street N.W. Harris & Ewing Collection glass negative. View full size.

The Investment Building in Washington at 15th and K Streets in 1925, shortly after its completion. Home to the barber shop seen here yesterday, the Investment Building was touted as being the first big office building in the East with an underground parking garage. Ten years ago it was torn down and replaced with a new structure designed by Cesar Pelli, who used the original limestone for the street-facing facades, which were propped up during demolition with a framework of steel girders. Except for the modern superstructure peeking over the top, the new Investment Building looks pretty much like the old one. National Photo Company Collection glass negative. View full size.

"Boy Scout training demonstration, 1912." Fifth in our series of bandaged, splinted and faux-injured Scouts. Harris & Ewing glass negative. View full size.

Washington, D.C., 1914. "District of Columbia. Alley clearance slum views." Harris & Ewing Collection glass negative, 5 x 7 inches. View full size.

District of Columbia, 1911. "Negroes. Negro life in Washington." Harris & Ewing Collection glass negative, Library of Congress. View full size.

October 1942. Inglewood, Calif. "Parts are marked with this pneumatic numbering machine in North American Aviation's sheet metal department." 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information. View full size.

July 24, 1929. "Norma Shearer (Mrs. Irving Thalberg)." The Oscar-winning actress at the White House. National Photo Co. glass negative. View full size.