The best approach to Derry’s walls is from the Guildhall Square, once the old quay, east of Shipquay Gate. The Neogothic ecclesiastical appearance of the Guildhall belies its true function as the headquarters of the City Council. Inside, the city’s history is depicted in a series of stained-glass windows. Most of the city’s cannons are lined up opposite here, between Shipquay Gate and Magazine Gate, their muzzles peering out above the ramparts. A reconstruction of the medieval O’Doherty Tower here houses the Tower Museum, whose showpieces are a series of stimulating displays and galleries recounting the city’s history and a splendid exhibition, spread over four storeys, focused on Spanish Armada Treasures, which features gold artefacts and finely worked jewellery from La Trinidad Valencera, which sank in Kinnegoe Bay (off Inishower) in 1588.