Using & Citing Images (a resource guide)
Guide to Finding Public Domain Works Online (The Public Domain Review)
Not all images in these collections are in the public domain.
Check licenses!
Open images and video from the Netherlands Institute for Sound and Vision. Check out the cat videos! Including cats playing chess and cat in a basket...
Art, artifacts, books, films and music from European museums, galleries, libraries and archives. See Free to Use Images.
The Public Domain Project from POND5 features thousands of historic media files available including film, images, audio and 3D models.