01. Tokyo, Japan
Urban area: 37.2 million people
City: 8.9 million people
Greater Tokyo is the largest urban agglomeration in the world, swallowing up the neighboring cities of Yokohama, Kawasaki, and Chiba. Despite its size, Tokyo has very efficient public transportation, which accounts for almost 80 percent of all journeys.
Urban Detail — Tokyo Bay has been gradually filled up to create more living space. Odaiba, an island made from waste, has become one of Tokyo’s most interesting tourist spots and destinations for day trippers. (Source: Miki Yokoyama)