City Wall - adjoining Salvation Army Citadel. The City Wall was 2⅛ miles in circumference when it was completed in 1534, almost 200 years after building began. This section was finished in the early 15th century and archaeological excavations on this site in 1960 revealed traces of a semi-circular bastion and a defensive ditch. In 1662, the wall was destroyed by order of Charles II, and now only fragments remain