I've had this idea too! Making a city, one that seems like it's just remains of a war. A Hot spot that I had in mind was a mall. Great for chest places, and some nice trap positioning.... Also, the city could be in the middle of mountains. Know what that means? Mines... Mines that could lead to all sorts of places, even under the city, making the map huge, great for open spaces, closed spaces, hiding spots for chest/traps/people. I'd be very interested in building a map like this, or at least give ideas for it.