A bit over a month ago I went to Gasworks park in seattle (abandoned industrial area turned to a park), and took texture photo references for a contract level I was about to do. The contract fell through, however, so now I can post the photo references online.
I was also hoping that other people here would post their photo references as well so that we could create a depot of photo refs for texture artists to browse and use. Right now there are a lot of photo references out there, but they are not taken with texture making in mind. Also, not everyone has a digital camera, or lives near cool places to go to to take references.