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, Tate Modern, British Library and 40 West End theatres. The London Underground is the oldest underground railway network in the world.
What is one of London's World Heritage Sites? Where is the British Museum located? Are there any bridges located in London? What is the name of one of the libraries located in London? What is the name of the oldest underground railway in the world? How many theaters does London's West End have? Where does Greenwich Mean Time marked? What famous palace is located in London? What is the name of the world's oldest underground railway? How many World Heritage Sites can be found in London?