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See the labelled diagram of Amiens Cathedral at the following web address: <http://en.wikipedia.org/wiki/File:Amiens_cathedral_floorplan.JPG>
Usually a cathedral.
there are 4 Cathedrals in London
Westminster cathedral
Southwark Cathedral
St. George Cathedral
St. Paul's Cathedral
London has many cathedrals, including St Paul's Cathedral, Westminster Cathedral, Southwark Cathedral and St George's Cathedral.
A cathedral