The Artstor Digital Library is an image database featuring an unparalleled range of images from some of the world's leading museums, photo archives, scholars, and artists in one easily-navigated repository. All images are accompanied by comprehensive metadata and are rights-cleared for educational use.
Britannica Image Quest is an online file of more than two million rights-cleared images from some 40 image collections. Complete metadata, which includes the source, copyright holder, caption, and keywords, is provided for every image.