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Built in 1656 along with the city walls to repulse the English and Portuguese, but it was poorly designed and the English overran the city in 1719. Later it was variously a cattle pen, city chambers and barracks, but restored as a fortress from the 1990s.
Neoclassical building of 1810. It shares its status with Tui co-cathedral.
Over 1500 works of art, including paintings, sculptures, drawings and applied arts. The best known artists exhibited are Carracci, Pourbus, Goya, Teniers, Fragonard and Prud'hon. There's also archaeology and history of the city.