Adds a city ranking system that is displayed in a new World's Greatest Cities screen (available via the Diplo Corner pulldown menu).
At the dawn of each new era, the highest ranked world city becomes a World's Greatest City, which allows that city to build a Triumphal Arch.
* Vanilla; Gods and Kings; Brave New World
Greatest Cities (v.11) 2016-10-05
Greatest Cities (v.11)