The Google Cultural Institute platform is open to non-profit institutions, museums, galleries, and archives with copyright-free or copyright-cleared content that they would like to share.
The New York Public Library offers a collection of searchable historical photographs online. Browse through their image collections, or search for a keyword.
The Web Gallery of Art is a searchable database of European painting and sculpture from 12th to mid-19th centuries. The site includes a database of fine arts museums, churches and a glossary of art terms.
An extensive collection of onlne photographs produced by the photography cooperative Magnum Photos. Go into Advanced Search, where you can limit by year, image type, or how results are sorted, and search for your topic.
