Here is a playlist of National Geographic’s “Megacities” series. I was poking around to find some architecture documentaries and ran across these. I grouped them first by cities and then by themes that they made episodes around. It starts out in North America with New York, checks in on Las Vegas (yeah, it’s basically a city in a desert… totally a lot of work to create a modern city there), pops down to South America, and then crosses the Atlantic to look at some European cities (London and Paris), and then jumps over to Asia, starting with Mumbai and then checking in on Hong Kong and Taipai. I’ve also found a Jakarta documentary, but the resolution is so low it would be an embarrassing addition to the playlist.