Possible Clues:

• London cathedral
• Seat of the Bishop of London
• Wren's cathedral
• Cathedral in London
• Last up on tour, singular London landmark
• London cathedral where Martin Luther King Jr. gave a speech in 1964
• London burial place of John Donne and Horatio Nelson
• Stone setter's building destroyed in 19
• Anglican cathedral in London
• Religious artefact in Last Supper only half sculpted