Runeterra sure does loves some verticality in it's settlements!
First it started with Bilgewater. A city where everything was built over cliffs because is easier to defend from attacks. You better have good legs for that stairs in the cliffs.
Then, Piltover and Zaun. Two cities built literally on top of each other, with one of them being more like a downtown the more down you go. Literally. At least these ones have elevators.
And then, we have Targon. A mountain that is literally being pulled up, with people living in the sides of the mountain. Do not forget to visit some of it's local curiosities like the sideways frozen lakes. Good luck iceskating there!
I'm pretty sure that when we get the expanded Noxus lore, we all gonna get extended details in the houses carved inside the Inmortal Bastion, and how the streets are disposed vertically instead of horizontally. [sg-miss-fortune]