London is the capital and most populous city of England and the United Kingdom. Standing on the Thames within the south east of the island of great UK, London has been a significant settlement for 2 millennia. London is a leading international city within the arts, commerce, education, amusement, fashion, finance, healthcare, media, skilled services, analysis and development, tourism, and transportation. It is crowned as the world's largest money Centre and has the fifth- or sixth-largest metropolitan space GDP within the world. London is a world cultural capital. It is the world's most-visited city as measured by international arrivals and has the world's largest city airport system measured by traveller traffic. London's universities form the most important concentration of higher education institutes in Europe.
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; and the historic settlement of Greenwich (in which the Royal Observatory, Greenwich defines the Prime Meridian, 0° longitude, and GMT). Other famous landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Paul's Cathedral, Tower Bridge, Trafalgar Square and The Shard. London is home to numerous museums, galleries, libraries, sporting events and other cultural institutions, including the British Museum, National Gallery, Natural History Museum, Tate Modern, British Library and West End theatres.