Enter some text about your interests or research topic into the Serendip-O-Matic, and get an intriguing array of related images and primary sources from the Digital Public Library of America (DPLA), Europeana, and Flickr Commons. A One Week | One Tool project.
PhotosNormandie is a collaborative collection of more than 3,000 royalty-free photos from World War II's Battle of Normandy and its aftermath. (Photos date from June 6 to late August 1944). The main link goes to the photostream. You can also peruse sets, which include 2700+ images from the US and Canadian National Archives.
On Flickr, vieilles_annonces posts scans from her "rather large magazine collection of Ebony, Jet and similar magazines from the 1910s on." [more inside]
While many quirky news buffs may be aware of the story of Phineas Gage -- the Vermont railroad foreman who had a three foot iron rod penetrate his skull as the result of an explosion and lived to tell about it -- fewer know that the only known photograph of him was recently discovered. Fewer still know that the identification of that photograph happened via a Flickr comment. (no thanks to you LA Times, previously) [more inside]
PictureAustralia lets you search across the image collections of a bunch of (mostly Australian, but a few international) cultural agencies. It's been running in various forms since 1998 and has just started accepting contributions through the Flickr groups PictureAustralia: Australia Day and PictureAustralia: People, Places and Events. [via Stuff v.3]