The Getty Research Institute has added thousands of new images to its Open Content Program. Two notable additions are the collections are 4,000+ images of tapestries from the 15th to 18th centuries, and the 77,000 images of Foto Arte Minore: Max Hutzel photographs of art and architecture in Italy, 1960-1990.
Per Getty:
"Hutzel comprehensively documented lesser-known monuments and churches, photographing exteriors, interiors, and an array of artifacts connected with art historical development in Italy... In some cases, Hutzel's photographs are the only records of structures or objects that have since been demolished, damaged, stolen, or rebuilt."
Check out the Inventory of Foto Art Minore or the rest of the Getty Open Content