Half-Man | Half-Static has collected some cool examples of comics cutaway drawings.
I love this kind of stuff, and when I was a kid I'd pore over the diagram of the Baxter Building, imagining what my room would be like if I were part of the Fantastic Four. Of course it would need a secret passageway to the Pogo Plane hangar. I'm sure I spent tens of hours drawing similar layouts for my own secret hideout.
You can see more here. Meanwhile, here's a map of Riverdale from an old Lil' Archie story by Bob Bolling.