On 8 September 1915, the most destructive air raid on London of the First World War took place. Zeppelin L13 dropped the largest bomb yet dropped on London. It fell on Bartholomew’s Close. The 660lb bomb caused an enormous amount of damage. But it revealed this: The gatehouse of St Bartholomew’s Church. A Tudor building that miraculously survived the Great Fire and been disguised by a Georgian cladding in the 18th Century. The cladding was blasted off to reveal the 16th Century building beneath. Today it houses the oldest residence in the City of London.