London is the location of a place.
The British Library is the national library of the United Kingdom and the second largest library in the world by number of items catalogued . The Library is now located in a purpose-built building on the north side of Euston Road in St Pancras , London ( between Euston railway station and St Pancras railway station ) , and has a document storage centre and reading room near Boston Spa , near Wetherby in West Yorkshire . 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 ) . 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 ( also known simply as the Underground , or by its nickname the Tube ) is a public rapid transit system serving London and some parts of the adjacent counties of Buckinghamshire , Essex and Hertfordshire in the United Kingdom .