the city's core, the ancient City of London, still retains its limited mediaeval boundaries; but since at least the nineteenth century, the name "London" has also referred to the whole metropolis that has developed around it.[10] Today the bulk of this conurbation forms the London metropolitan region[11] and the Greater London administrative area,[12] with its own elected mayor and assembly.[13] London is the world's foremost global city alongside New York City[14][15][16][17][18] and the largest financial centre alongside New York City and Tokyo[19][20] and one of the most important cultural centres.[21] London's influence in politics, education, entertainment, media, fashion and the arts contributes to its preeminent position. Central London is the headquarters of more than half of the UK's top 100 listed companies (the FTSE 100) and more than 100 of Europe's 500 largest companies. The city is a major tourist destination for both domestic and overseas visitors. London hosted the 1908 and 1948 Summer Olympic Games and will host the 2012 Summer Olympic Games. 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.[22] London has a wide range of peoples, cultures, and religions, and more than 300 languages are spoken within the city.[23] On July 2007, it had an official population of 7,556,900 within the boundaries of Greater London[24] making it the most populous municipality in the European Union.[6] Since 2001 the Greater London Urban Area has been the second largest in the EU after Paris with a population of 8,278,251,[2] and the metropolitan area is estimated to have a total population of between 12 million[3] and 14 million,[4] the largest metropolitan area in the EU. The public transport network, administered by Transport for London, is the most extensive in the world,[25] 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.[26] London was named by New York Magazine as the capital of the world for the 21st century.[2