I've decided to call the city 'Ganymede' because I had a really profound dream about that moon of Jupiter one night while I was making it. This is just over 2 weeks of progress from the inner ring with the big tree in!
Only called it a mega-city to distinguish it from the last picture I released in which I called it a city!
Village -> Town -> City -> Mega-City -> ??? (Idk what the next stage is!)
Hope you enjoy
[EDIT 22/3/2012]: Currently working on this again! Gonna be a 'Giga-City'