You know with the economy the way it is I am sure we will be seeing more modern buildings being abandoned. But here is a good website that has a lot of what you want.http://www.ghosttowns.com/states/co/co.h��
down in the five point area there would be some great photo spots, also take I70 up into the mountain towns and there are quite a few abandoned mines and mining towns.
There are several up around Central City - Victorville and Glory Hole Mine. Most are right along the road. Just drive around and watch.