Tokyo (東京, Tōkyō) is Japan’s capital and the world’s most populous metropolis. It is also one of Japan’s 47 prefectures, consisting of 23 central city wards and multiple cities, towns and villages west of the city center. The Izu and Ogasawara Islands are also part of Tokyo. Prior to 1868, Tokyo was known as Edo. Previously a small castle town, Edo became Japan’s political center in 1603 when Tokugawa Ieyasu established his feudal government there. A few decades later, Edo had grown …