The Flickr Commons is a curated section of Flickr, launched in association with the Library of Congress in 2008, to collect historical content in one easy-to-find, public place. A lot of this content is donated generously, open for public use. Think of it as the U.S. digital heritage.
Most recently, they’ve launched a new section of photos from NASA, featuring piles of historical material. Their sets are organized into three sections: Building NASA, Launch/Takeoff, and NASA Center Namesakes.
(via The Atlantic)