London is home to as many as four UNESCO World Heritage sites (the Tower of London, Kew Gardens, Palace of Westminster and the Greenwich historic settlement) and a number of world-class attractions which delight even the most demanding visitors such as the Tower Bridge, Buckingham Palace, London Eye, Trafalgar Square, Piccadilly Circus, Wembley Stadium, Wimbledon, The Gherkin and St Paul???s Cathe