Pretty darn cool image archive of public domain content: pdimagearchive.org?utm_source=n.... Brought to you by the Public Domain Review folks (whose newsletter of images and stories I greatly enjoy.)
Public Domain Image Archive
Explore our hand-picked collection of out-of-copyright works, free for all to browse, download, and reuse. This is a living database with new images added every week.
pdimagearchive.org