A Brooklyn art gallery created this stunning online exhibit of their Russian Photography Collection: 1917-1945. This image "Pojarnaia lestnitsa" (Fire Escape) was taken in 1925 by my favorite avant-garde photographer, Constructivist artist Aleksandr Rodchenko. From the exhibit summary:
The collection was assembled as the Soviet Union tore itself apart leaving a tattered social fabric behind. Organized as a history of 20th century photography of the Soviet Union the collection focuses on the categories: Constructivism/Avant-Garde, Propaganda, Photo-Reportage, War Photography, and Socialist Realism which provide the most effective and complete view of one of the most incredible experiments in human history.
