PORTO CARD: the best way to know the best in Porto! Free admission to 11 museums, 50% discount on 13 museums and monuments, including Serralves, guided tour of Casa da Música and Palácio da Bolsa. 50% discount at the Santo Inácio Zoo and 35% off at SEA LIFE and World of Discoveries. Up to 25% discount on more than 50 tours in Porto and Northern Portugal.