London is the capital of both England and the United Kingdom, and the largest urban area in Europe (excluding Moscow). The city is a major tourist destination both for domestic and overseas visitors, with annual expenditure by tourists of around £15 billion. London hosted the 1908 and 1948 Summer Olympic Games and will host the 2012 Summer Olympic Games.
Greater London contains four World Heritage Sites: the Tower of London; the historic settlement of Greenwich; the Royal Botanic Gardens, Kew; and the site comprising the Palace of Westminster, Westminster Abbey and St. Margaret's Church.
London's population draws from a wide range of peoples, cultures, and religions, and over 300 languages are spoken within the city. As of 2006, it had an official population of 7,512,400 within the boundaries of Greater London and is the most populous municipality in the European Union. As of 2001, the Greater London Urban Area had a population of 8,278,251 and the metropolitan area is estimated to have a total population of between 12 and 14 million, the largest metropolitan area in the EU. The public transport network, administered by Transport for London, is one of the most extensive in the world, and Heathrow Airport is the busiest airport in the world by international passenger traffic and the air space is the busiest of any city in the world.