19.20.21 (19 cities in the world with 20 million people
19.20.21 (19 cities in the world with 20 million people in the 21st century) is a nice site for an effort to undertake “a five-year study that will encompass all aspects of the phenomenon of supercities” but the real attraction are the maps of the world’s largest cities through time (Menu/10 Largest Cities). In 1000, the largest city in the world was Cordova, Spain and by 1500, 4 of the top 10 were in China and one was in Nepal. (via snarkmarket)
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