J. Paul Getty Museum/Getty Research Institute Open Content Images
More than 10,000 images from Getty holdings across the institution. Includes "drawings and watercolors, artists’ sketchbooks, rare prints from the 16th through the 18th century, 19th-century architectural drawings of cultural landmarks and 19th-century photographs of the Middle East and Asia... The Getty plans to continue to add images, until eventually all applicable Getty-owned or public domain images are available, without restrictions, online."