London is the capital and most populous city of England and the United Kingdom, and within the circumference of the M25 motorway. It sits on the River Thames.
London has a diverse range of people and cultures, with more than 300 languages spoken in the region of an estimated population of 8.7 million, accounting for 12.5 per cent of the UK population.
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 marks 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.
The London Underground is the oldest underground railway network in the world.
Heathrow Airport is the Busiest in the UK.