Viana do Castelo, set between the Atlantic Ocean and the Serra de Arga mountains, blends tradition with contemporary architecture. While known for its historic center and Manueline landmarks, the city is also home to striking modern works — including Souto de Moura’s Pousada de Viana and Siza Vieira’s Biblioteca Municipal. Its architectural landscape reflects the region’s balance of heritage, modernity, and scenic beauty.