The greatest cities on Earth are always in motion. Their bustling activity forms a great collective organism, whose shape changes over time. So there's a good reason why we're all fascinated by timelapses of cities — and there's nothing cooler than timelapses of aerial footage. See the world's biggest cities in a whole new way.
Somebody should stop me, because this made me muse again. Wealth is a measure of how much money or resources generated from a unit of human endeavor. So it's fundamental unit is either a manhour (sexist unit of work) or a thought hour (time taken to generate a new concept/idea) It amazes me that the wealth generating systems, aka cities, are not exactly aligned with GDP and cash wealth of the countries. Could there be a lag in the global system or something else in play?