London - The first world city
From its Roman beginnings through its explosive growth in the 19th century, London was the greatest city the world had ever seen. This huge metropolis continued to grow through the 20th century, reaching a population of 7.5 million in Greater London.
A vital part of London's success was the transport system that developed alongside the Capital in the 19th and 20th centuries-truly the lifeblood of this great city. Today London takes its place among other world cities, not as the world's largest urban centre, but still one of the most visited, diverse and cosmopolitan cities on earth.