File under: Coolest thing done with an empty airplane hangar
The Legacy Photo Project has turned an abandoned hangar on the former MCAS El Toro in Irvine, California into the world’s largest camera obscura. Producing an image 28 feet high and 108 feet wide on a single piece of fabric, Building #115 used to house fighter planes and later, helicopters.
See this article from Photo District News written before the image was exposed.
Stats and background at the Legacy Photo Project website.