Which cities anywhere in the world are growing both in population and urban structure at a high rate?

I’m wondering if there are any cities in the world that are growing as fast, and vast as say San Francisco, New York, Tokyo (catch my drift? City cities…)

Also, are architects predominantly sticking to the rectangle type of buildings? Or are there more cone, or oval type buildings?

Also also, do you know of any major non traditional architectural buildings like this project: called Crystal Island in Russia going on?

Do you think the U.S.A. will ever start creating huge cities again? Similar to S.F., Chicago & N.Y.? Or are we merely going to keep adding infrastructure to the cities we currently have.
(I ask this question because it seems in Downtown San Diego a ton of construction is going and it’s becoming extremely nice and more city like compared to my memory in the 90s)