I love this shot, of youngsters sneaking under a circus tent in 1936 New Mexico. (click image for a larger version)
Photo by Arthur Rothstein. [American Memory link]
Showcasing some of the 160,000 images taken between 1935 and 1944 by government-hired photographers. (If you were to look at 100 of them per day, every day, you'd need more than four years to view them all).