There's a web site out there that has a lot of ruined buildings. The theme is Warhawks 40k (big robot-looking soldiers). Go to Daz 3d's freepository and do a search on WH40k. There's a whole mess of the stuff, but one of the sites has at least 3 ruined buildings( long list of sites. May be tedious, though).

Ed Baumgarten might have some buildings at baument.com.

I think Blacksmith 3d has medieval buildings.

I remember a very old (Poser 3) site that has some Roman stuff. Check freebies here.

Matrix; should be some stuff out there. I remember a tutorial to make the robots, but I can't remember where.

Hope these vague pointers help...;)

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)