
In Greater London there are four distinctive places as World Heritage Sites: the Tower of London, the settlement of Greenwich, the Royal Botanic Gardens, Kew, and the place covered by the Palace of Westminster, Westminster Abbey and the Church of Santa Margarita.6
London's population is made up of a wide range of ethnicities, cultures, and religions, and in the city speak over 300 languages. In 2007 the official population was 7,512,400 in Greater London area. The Greater London Urban Area has a population of 8,278,251 and the metropolitan area, the largest in the EU, has an estimated population of 12 to 14 million people. The public transport network, administered by Transport for London, is one of the largest in the world, and Heathrow Airport is the busiest international airport by passenger volume in Europe.