 A walled precinct, the Liberty of St Andrew, encloses the twelfth century Cathedral, the Bishop's Palace, Vicar's Close and the residences of the clergy who serve the cathedral.Entrances include the Penniless Porch, The Bishop's Eye and Brown's Gatehouse which were all built around 1450.The Church of St Cuthbert (which tourists often mistake for the cathedral) has a fine Somerset stone tower and a superb carved roof.