Mineforgian
City XXL is an amazing superplan minecraft map with a realistic giant city with all kinds of buildings, such as shops, buildings, houses, skyscrapers, offices, rocket launch stations, and many others.
Recomended Minecraft Version: 1.12.2
Supported Minecraft Versions: 1.12-Snapshot; 1.12; 1.12.1; 1.12.2; 1.13-Snapshot; 1.13; 1.13.1; 1.13.2
Some pictures here:
You can see more at Planet Minecraft.