I've been doing research today, looking at Italy in the early-20th-century Edwardian era. Happily, the Oregon State University Archives have a whole host of early photographs, circa 1915, on The Commons on Flickr. When I'm looking for old photographs for writerly reference, I usually swing by The Commons early in my search, just for instant gratification. Sometimes you stumble across truly cool photos. So: fun place to hang out, electronically, and nice source for people who need quick reference photos.
Enjoy some Edwardian Florence, Italy (all photos via Flickr):