January 1941. "Going to Mass. Pittsburgh, Pennsylvania." Medium format acetate negative by John Vachon for the Farm Security Administration. View full size.

February 15, 1950. "N.Y. Telephone Co. headquarters and the World-Telegram building, from a helicopter." Photo by Al Ravenna for the New York World-Telegram & Sun. View full size.

Washington, D.C., 1936. "Bus transportation -- driver of Greyhound coach to New York." Seen earlier here. 4x5 inch glass negative, Harris & Ewing Collection. View full size.

"Abraham Lincoln, presidential candidate, half-length portrait, facing right." Circa 1881 albumen silver print from a glass negative by Alexander Hesler. View full size.

        Photo of Lincoln made from a negative taken in Springfield, Illinois, by Alexander Hesler on June 3, 1860. "Wrote Lincoln's law partner, William H. Herndon, 'There is the peculiar curve of the lower lip, the lone mole on the right cheek, and a pose of the head so essentially Lincolnian; no other artist has ever caught it.' "

Washington, D.C., circa 1918. "Liberty Loan bonds -- Bureau of Engraving and Printing." Financing the war effort. 8x10 inch glass negative, Harris & Ewing Collection. View full size.

        UPDATE: As noted by our astute commenters, the store shown here is now the home of Bill Green's restaurant, Gullah Grub.

July 4, 1939. "A Fourth of July celebration. St. Helena Island, South Carolina." 35mm color transparency by Marion Post Wolcott for the Farm Security Administration. View full size.

Washington, D.C., 1936. "Bus transportation -- Greyhound Lines motor coach to New York." 4x5 inch glass negative, Harris & Ewing Collection. View full size.

Washington, D.C., circa 1911. "Mawhinney, M., Miss." Mary Mawhinney at the harp. Harris & Ewing Collection glass negative. View full size.

Washington, D.C., 1924. "Flat spare tires are numerous around Washington these days due to the youthful football players who have found an easier way to inflate the pigskin than using their lungs. 'Billy' Friel shown inflating his football." 4x5 inch glass negative. View full size.

Washington, D.C., 1936. "Bus transportation -- loading baggage on motor coach." 4x5 inch glass negative, Harris & Ewing Collection. View full size.

September 1943. "Pittsburgh, Pennsylvania. Passengers in the waiting room of the Greyhound bus station." Nitrate negative by Esther Bubley for the Office of War Information. View full size.

Washington, D.C., 1936. "Bus transportation -- Greyhound Lines driver at station with coach bound for New York." 4x5 inch glass negative, Harris & Ewing Collection. View full size.

Washington, D.C., circa 1936. "NO CAPTION" is all it says here. Feel free to improvise in the Comments below! Harris & Ewing Collection glass negative. View full size.

        All of Washington is looking forward to the arrival of the famous Mack Sennett girls, who are due to reach this city in the near future, and who are to appear every day on the stage at one of the local theaters in conjunction with the much-heralded feature photoproduction "Yankee Doodle in Berlin." -- News item (Washington Post)

Washington, D.C., circa 1919. "Mack Sennett girls." An assortment of the theatrical impresario's "bathing beauties," last seen here. National Photo Co. View full size.

October 1955. "Actors Marilyn Monroe and Maurice Chevalier posed on top of an upright piano." Color transparency from photos by Milton Greene and Arthur Rothstein for the Look magazine assignment "Scene Stealers: Theatrical Clothes in Everyday Fashion." View full size.