Premise: The British Library is the national library of the United Kingdom and the second largest library in the world by number of items catalogued . Buckingham Palace ( [ ˈbʌkɪŋəm_ˈpælɪs ] ) is the London residence and administrative headquarters of the reigning monarch of the United Kingdom . London . 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 .
Hypothesis: London is the location of a place.
Label: ENTAILMENT