WARNING UBER GEEKERY.
Back in 1996 I used to play Sim City all day.
This person spent 3 years designing a super high density city that is near perfect.
It’s mental, it has no roads and only uses subways and it’s as dense as it could possibly be, I guess it’s pretty unrealistic but still super interesting.
Found out about it on Super Colossal, he has written a great article about it too, well worth a read.