This diagram shows the Tower and Bridge from the Old School City map overlayed on the first three levels of my old school dungeon. The City is in black, outline of first level is in blue, outline of second level is in green, outline of third level is in red.
*** NEW IMPROVED DRAWING COURTESY of She-who-must-be-obeyed ***
Here's two dungeon cut throughs as well. Top cut through is from East to West; bottom cut through is from North to South.