"With more than 2 million images* (and growing), scholars can easily examine wide-ranging material such as Native American art from the Smithsonian, treasures from the Louvre, and modern architectural plans from Columbia University. Composed of approximately 300 curated sub-collections, Artstor supports and enriches study across disciplines, including world events from Magnum Photos, anthropology from Harvard’s Peabody Museum, and archaeology from Erich Lessing Culture and Fine Art Archives and, making it a resource for your whole institution." -- ARTstor
The Internet provides a great amount of information in the area of art: