The ARTstor Digital Library is an image database featuring works of art and other cultural heritage from some of the world's leading museums, photo archives, scholars, and artists in one easily-navigated repository. The library of 2 million images is constantly growing. All images are accompanied by extensive metadata and are rights-cleared for specified educational uses.

A descriptive and bibliographic index of thematic and iconographic content of early Christian and medieval art from apostolic times to 1400 A.D. The online database contains all of the works electronically processed for the print version of the index at Princeton University since 1991 (over 23,000 work of art records as of June 2002), including a growing number of images and bibliographic entries covering iconography, art history, archaeology, and classical and religious studies.