Long-Lost Photos Show What Hasn't Changed About Motherhood In 50 Years. Is a collection of 50 year old photos from around the world by Ken Heyman. Taken originally for the pulitzer-nominated book Family (co-authored with Margaret Mead), they were left sitting in a storage container for decades.
The Hajj: an excellent photographic journal of Islam's annual pilgrimage.
The George Eastman House photography collection is simply incredible and merits hours of browsing. I particularly enjoyed the color prints of Nickolas Muray and this gallery of old stereo slides