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.