Here's a collection of rare historical photos from Oak Ridge, Tennessee, a town established by the Army Corps of Engineers in 1942 on an isolated farm. It was a secret location that became one of the most significant sites of the Manhattan Project.
Workers load uranium slugs into the X-10 Graphite Reactor's 44 by 44 feet (13.4 m) concrete face, 1943
(via Wikimedia Commons)
The whole book is available on Sparehed.
City Sign, 1960
The photos are from doe-oakridge, except when noted otherwise.