Sixty-two years ago New York and Tokyo were the world’s only megacities with over 10 million residents. Now there are 23, and the UN predicts (pdf!) a total of 37 by 2025. All but eight of these cities will be located in the developing world – and the quality of life for millions will be determined by the quality of their cities.
The guardian made a quite impressive interactive map showing the 100 most populous cities as of 2012 according to the UN (megacities are shown with a black border), in order to explore the latest estimates and forecasts on the growth of these ‘cities on steroids‘. The database contains historic pictures of the first megacities, satellite images of the Pearl River Delta and statistic data of all these 100 cities. Coolest on full screen!