ARTstorThe ARTstor Digital Library provides more than one million images, along with tools for teaching and research. Its
collections comprise contributions from outstanding museums, photographers, libraries, scholars, photo archives, and artists and artists' estates from all over the world. The collections encompass a wide variety of subject areas, including art, architecture, music, religion, anthropology, literature, world history, American Studies, Asian Studies, Classical Studies, Medieval Studies, Renaissance Studies, and more. ARTstor's
Subject Guides may be a helpful place to start.