Welcome to Smithsonian Open Access, where you can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to nearly 3 million 2D and 3D digital items from our collections—with many more to come. This includes images and data from across the Smithsonian’s 19 museums, nine research centers, libraries, archives, and the National Zoo.

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This is fun to browse through. "From an initial gift of eight prints and one drawing, The Museum of Modern Art's collection has grown to include 150,000 paintings, sculptures, drawings, prints, photographs, architectural models and drawings, and design objects. MoMA also owns some 22,000 films, videos, and media works, as well as film stills, scripts, posters and historical documents. The Museum's Library contains 300,000 books, artist books, and periodicals, and the Museum Archives holds approximately 2,500 linear feet of historical documentation and a photographic archive of tens of thousands of photographs, including installation views of exhibitions and images of the Museum's building and grounds."

From the US National Library of Medicine, a huge collection of free, public-domain images from anatomical atlases. A great wealth of material. Wish it were designed better and that the books were all scanned rather than some photographed.