20th Century Rocks
This site has been around for some time me thinks yet remains an ongoing treasure trove of old timey photographs from contributors and the public domain.
Shorpy.com is a vintage photography blog. It posts digitally enhanced photographs acquired from a variety of sources, including the Library of Congress and National Archives. Most of the photographs presented on the website date to the early twentieth century. Dave Hall, a former Washington Post copy editor, founded and runs the site. The blog is named after Shorpy Higginbotham, a child laborer who worked as a greaser in an Alabama coal mine. Higginbotham was killed in a mining accident in 1928. (Wikipedia)
The Shorpy Gallery offers 4000+ fine-art prints suitable for framing. Desk-size to sofa-size and larger, on archival paper or canvas.