Porto Cathedral: Porto's cathedral, the Sé, is an architectural mix of Romanesque, Gothic and Baroque styles, and one of the oldest buildings in the city. The cloisters feature beautiful azulejo tilework, and the view from the terrace – of the old-town streets tumbling down towards the Douro – is excellent.
Palácio da Bolsa (Stock Exchange Palace): For an indication of the wealth pouring into Porto from the 19th century, join a tour of the stock exchange, the Palácio da Bolsa, whose interior halls display an almost obscene level of richness. The extraordinary Salao Årabe – inspired by the Alhambra in Granada – is probably most famous for its stunning interiors.
Church of St Francis: The rather plain faşade of the Church of St Francis, now deconsecrated, conceals a fabulously opulent, gold-covered interior, refurbished in the 18th century. It's probably best known, however, for its bizarre Capela dos Ossos, the "chapel of bones" in the catacombs.