Most likely Tokyo, Japan.
The most northern city in the world is Honningsvag, in Norway.
Johannesburg
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Venice is a modern world city that is built on the water. Venice is a city in Italy is made up of 118 islands and connected by bridges. The current mayor of Venice is Giorgio Orson.
hawii
The Vatican comes immediately to mind.
what is the most valuable cultural legacy for the modern world from the first civillizations
Considering most of the environment in Minecraft is what appears to be a more primitive world with some advanced stuff (i.e. pistons, redstone, jukebox, disk etc.) in it, I do not think there is a seed for a modern city. However, it is not confirmed.
Ontario, Canada, has more laws then any other city in the world making it the most governed city in the world.
what is the most valuable cultural legacy for the modern world from the first civillizations
London is the city in the world that is most visited by the tourists in the world.