An unusual rock formation in Chattanooga appears perilously balanced; but more than thirty people can stand on its top at one time. It's called Umbrella Rock. In one of the earliest picture of Umbrella Rock is of soldiers taken in 1863. Today, of course, it looks different. [more inside]
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]