A GIF Showing The Location Of The World's Largest City Since 2000 BCE
This nifty animation, from Redditor simongerman600, shows the location of the largest city in the world at 50 year increments over the last 4000 years.
Unsurprisingly, things get started in in the Fertile Crescent where civilization itself began, but the map spends most of its time in China (and makes only the briefest stop in the Americas):
