The National Gallery of Art in Washington, D.C., has created a user-friendly digital image library of works in their collection. Most astonishing is that more than 22,000 of the images are open access, i.e. in the public domain!
Posts on March 2013
Thanks to a donation from Joy Ziegeweid, MUP '07, AAEL Images has a collection of 100 images of Russian Constructivist architectural monuments in Moscow. Taken in 2005, the images show the state of the buildings (and often their urban context) at that time. All images are licensed CC BY-SA, so anyone is free to use them with proper attribution!
If you work at all with images - and all of us do, right? - you'll need to know about copyright and fair use. If you're not a lawyer and steeped in the details of the law, you'll likely find reviewing the issues every few months to be helpful. Here are a few sites with clear and succinct explanations: