Are there really sites undisturbed enough for you to see how they did repairs or disposed of their trash? That sounds amazing.
SW-America is definitely on my bucket list and I love ghost towns. In Western Europe it's hard to find any abandoned place older than a couple of years that's preserved well. I guess it's because the next city is never very far and there's always uncultured idiots whose idea of fun it is to vandalize places for no reason.