Click here for a view of the arch from the depot.

Denver, Colorado, circa 1908. "Welcome arch and Union Depot." Where blurry pedestrians risk the retoucher's brush. 8x10 glass negative. View full size.

June 1943. Arlington County, Va. "Arlington Farms, war duration residence halls. A room at Idaho Hall." Sunny yet noirish photo by Esther Bubley. View full size.

Washington, D.C., 1920. "Lust baby show." Which is probably not what it sounds like -- a baby contest at Poli's theater organized by cinema impresario Sidney Lust would be our guess. National Photo Company glass negative. View full size.

Circa 1911, our third selection from the panoramic series "Washington from Washington Monument." Landmarks include, from left, Memorial Continental Hall (headquarters of the Daughters of the American Revolution); the Corcoran Gallery of Art; State, War and Navy Building; and White House West Wingtip. 8x10 inch glass negative, Detroit Publishing Company. View full size.

1864. "Point of Rocks, Va. (vicinity). Redoubt Zabriskie on Appomattox River." Wet plate negative, Library of Congress Civil War Collection. View full size.

January 1908. New York. "Mrs. Finkelstein, 127 Monroe Street. Bessie (age 13), Sophie (age 7). Girls attend school. Making garters for Liberty Garter works, 413 Broadway. Mother, a widow, earns 75 cents a day by working all day until 12 at night. Bessie works until 10 p.m., Sophie until 9. They expected to work until 10 p.m. to finish the job, although they did not know when more work would come in. Witness Mrs. Hosford." Glass negative by Lewis Wickes Hine. View full size.

Washington, D.C., circa 1928. "Library for Blind, B Street S.E." Another of those photos where the points of greatest interest are at the periphery -- the Sanitary Barber ("Ladies Hair Bobbing a Specialty") at left, and Hall-Kerr Motors, a Hudson dealer, on the right. National Photo glass negative. View full size.