If any of you folks use Facebook, there's a fellow with a page called "Building in the Past" who posts photos of old west buildings and such several times a day. I've been following him for several months and some of the pictures that he's put online are really quite stunning. The photos range from the mid-1800s through around 1945 or so.
His Facebook page is at
https://www.facebook.com/BuildingInThePast.