Now something different to citiesXL, but that is maybe interesting for you as citybuilding fans as well. Today I found on the web a panoramic view of London taken by Jeffrey Martin and posted on his blog . This photo has incredibly 80 Gigapixel (or 35 meters long and 17 meters tall) 😯 it seems that this is world record . Its amazing how far you can zoom, and how much details you can see in this image. Well…. and in germany people complaning about google streetview 
Anyway, test it your self: London World Record Panoramic Photo
Here some previews from his blog:
Its amazing funny to spy people with this XD try and find some weird stuff 😀