Many of the collections housed in museums and libraries the world over are in the public domain – freely usable by the public.
The Creative Law Center offers a comprehensive list of US and UK organisations that offer open access high-resolution images and other rare visuals.
Here are some more sources to public domain art from museum and library collections.
1. Library of Congress
The Library's digital collection has millions of items including photos, prints, manuscripts, sound recordings and more that are free to use and reuse.
All the content is either in the public domain, has no known copyright, or has been cleared by the copyright owner for public use.
2. New York Public Library
The New York Public Library's digital collection has over 800,000 prints, photographs, maps, manuscripts, streaming video and more.
3. The British Library
The British Library has uploaded over a million illustrations that are in the public domain to Flickr.
4. Old Book Illustrations
Old Book Illustrations offers a range of public domain, royalty-free images scanned from old books.
Searchable galleries include animals, buildings and monuments, plants and landscapes.
5. The Public Domain Review
The online journal and not-for-profit project, The Public Domain Review, has curated collections of public domain images, texts and films.