Worlds Biggest Cities

Worlds Biggest City - Osaka
The city is the capital of Osaka Prefecture. Often dubbed the second city of Japan[citation needed], Osaka was historically the commercial capital of Japan, and to date the heart of Japan’s second largest[citation needed](and the world’s ninth largest[citation needed]) metropolitan area of Osaka-Kobe-Kyoto, whose population is 17,220,000.
A unique title that the [...]

Other info about one of the worlds biggest cities
Tokyo was originally known as Edo, meaning estuary.[2] Its name was changed to Tokyo (Tōkyō: tō (east) + kyō (capital)) when it became the imperial capital in 1868.[2] During the early Meiji period, the city was also called “Tōkei”, an alternative pronunciation for the same Chinese characters [...]