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. Located on the banks of River Thames, in the southeast of England, London offers its tourists an assortment of natural, cultural and historical sites. City of London is the area of London that lies within the ancient city walls and is now a major world financial centre.
London attracts over 14 million international visitors per year, making it the world's most visited city. London contains four World Heritage Sites - the Tower of London, Kew Gardens, the site comprising the Palace of Westminster, Westminster Abbey, and St Margaret's Church. The term Greater London embraces Central London together with all the outlying suburbs that lie in one continuous urban sprawl within the lower Thames valley. Though densely populated by New World standards, London retains large swathes of green parkland and open space, even within the city centre. London is full of wonderfully eccentric museums and bizarre historic collections, art galleries, Big Ben, Royal London and many world famous attractions. Greater London consists of 32 London boroughs and the City of London that, together with the office of the Mayor of London, form the basis for London's local government