Contains over a million images in architecture, painting, sculpture, photography, decorative arts, design and more. Note: As of August 22, 2011, ARTstor users are required to register and log in before downloading images.
The Artstor Digital Library is a resource containing over 2 million images from the world's museums, archives, libraries, scholars, and artists. Use Artstor to find images for papers, presentations, and study in the humanities. There's also a set of tools for sharing images, curating groups of images, downloading them directly into powerpoint presentations, and comparing and contrasting images.