Yeah I did this vid:
https://www.youtube.com/watch?v=qELcbKXdRm8

All the cities that I know of and I am aware of are in that map but many of them are small due to the scale of the maps. Each tile is notionally / approximately 400 mi across so at the screen res of 1500 and with 6 tiles across thats 1px per mile or so. So you wont see much until you zoom in. Even at 15K pix across that means a mile is 10 pix so no city is going to show up in any kind of detail. You need a zoom browser with a very large scaling set of tiles rendered to see any detail like that - more than I think anyone but the likes of google themselves would want to have a data center to run the tiles out of. This is the reason I dont think a web based / tile based zoom solution is the right one. That and you cant edit it without a full tile set re-render.