Noisy, vibrant and truly multicultural, London is a megalopolis of people, ideas and energy. The capital and largest city of both the United Kingdom and of England, it is also the largest city in Western Europe and the European Union. London is one of the great "world cities," and remains a global capital of culture, fashion, finance, politics and trade.

London contains four World Heritage Sites: the Tower of London; the Royal Botanic Gardens, Kew; the site comprising the Palace of Westminster, Westminster Abbey and St. Margaret's Church; and the historic settlement of Greenwich (in which the Royal Observatory marks the Greenwich Meridian (0° longitude) and GMT).

London has a diverse range of peoples, cultures and religions, and more than 300 languages are spoken within its boundaries.  

The London Underground network, is the oldest underground railway network in the world and the most extensive after the Shanghai Metro. London Heathrow Airport is the world's busiest airport by number of international passengers and the airspace is the busiest of any urban centre in the world.