Washington, D.C., circa 1922. "Chesapeake & Potomac Telephone Co." The maintenance shed. National Photo Co. Collection glass negative. View full size.

Art class circa 1940. "Montgomery High School students, Maryland." Our third or fourth photo from Montgomery High. Anyone have an old yearbook from there? National Photo Company Collection safety negative. View full size.

"Secretary Davis, Christmas tree, 1921." James J. Davis, Secretary of Labor in the Harding, Coolidge and Hoover administrations, moonlighting as Santa Claus. National Photo Company Collection glass negative. View full size.

Washington circa 1914. "H.E.F. & A.W.L. in Detroiter." Herbert E. French, driving, was the owner of National Photo Company; "Artie" Leonard was one of its photographers. They're at the Tidal Basin on the Inlet Bridge, with the Washington Monument in back. National Photo glass negative. View full size.

The Raleigh Hotel at 12th Street and Pennsylvania Avenue in Washington circa 1920. National Photo Company Collection glass negative. View full size.

May 9, 1960. A landmark image in the history of modern architecture: Julius Shulman's nighttime shot of Ann Lightbody and Cynthia Murfee in Case Study House No. 22, the Stahl residence in the Hollywood Hills, overlooking Sunset Boulevard. Architect: Pierre Koenig. The photo, taken with a Swiss-made Sinar 4x5 view camera, is a double exposure: Seven minutes for the background, then a flash shot for the interior, the house lights having been replaced with flashbulbs. There's a fascinating account of the image at Taschen, where you can order a book on the Case Study houses. View full size | L.A. Mag article.

Oak Park, Illinois, 1952. My grandmother (left), mother (center), and aunts. One of my cousins is leaning against the wall, her feet visible in the lower center of the photo. The occasion was probably a holiday, as the ladies are wearing their Sunday best, and that huge cooking pot had to have held a turkey. My mom, the only adult in the photo who's still with us, thinks it may have been Christmas. 35mm slide. View full size.