I've always been really fond of this picture. It was taken on the day of my grandparents' wedding in 1948. My grandmother was 21 at the time and my grandfather was 22. View full size.

December 1942. "Worker inspecting a locomotive on a pit in the roundhouse at the Chicago & North Western RR's Proviso Yard." 4x5 Kodachrome transparency by Jack Delano for the Office of War Information. View full size.

"Untitled -- November 27, 1923." Who can figure out what's going on here? National Photo Company Collection glass negative. View full size.
Update: Stanton Square rides to the rescue with the answer: It's the vaudeville strongman Zishe Breitbart, who was something of a legend in his own time.

March 1936. "Negro barber shop, Atlanta." Large-format nitrate negative by Walker Evans for the Resettlement Administration. View full size.

Washington, D.C., circa 1921. "Junior high school shop." The same school as Monday's art class. Harris & Ewing Collection glass negative. View full size.

"Income Tax circa 1920." One of the happiest times of the year in our nation's capital, like Christmas and the Fourth of July rolled into one joyous orgy of giving. Excited citizens lined up around the block waiting their turn at the Internal Revenue Service, checkbooks in hand! National Photo Co. View full size.

Washington, D.C., circa 1926. "Internal Revenue." A seasonal reminder from Shorpy. National Photo Company Collection glass negative. View full size.