Berlin : eine Kulturgeschichte in Bildern und Dokumenten / Wolfgang Schneider ; Bildausw. und -zsstellung. von Wolfgang Gottschalk (Though in German and published in 1983, includes nearly 600 illustrations relevant to Berlin: Main Libr DD860 .S35 1983)
ArtSTOR (licensed image database - contains many representations of Berlin, in art and architectural photographs)>
Main Page - Wikimedia Commons (Wikimedia Commons provides images in the public domain)
Yahoo! Image Search (Includes more images than Wikimedia Commons, but many are commercial)
