Porto rewards walking downhill: the granite churches and tiled stations are in the upper town, the market and bookshop in between, and the river and port lodges at the bottom.
Livraria Lello
The 1906 bookshop on Rua das Carmelitas with the forked staircase, open daily 09:00–19:30. Entry is ticketed and the ticket works as a voucher against a book, so buy one if you were going to anyway; book a slot online because walk-up queues are long.
Torre dos Clérigos
The eighteenth-century baroque bell tower next to Lello, open daily 09:00–19:00, with a narrow stone spiral to a viewing gallery over the whole city. The climb is tight and two-way in places; not for anyone unsteady on stairs.
Palácio da Bolsa
The nineteenth-century merchants' exchange at Rua Ferreira Borges, run by the Associação Comercial do Porto and visitable only on a guided tour, which is what gets you into the Moorish-revival Arab Room. Book a time slot in advance.
Mercado do Bolhão
The restored 1914 market at Rua Formosa 322, open Monday to Friday 08:00–20:00 and Saturday 08:00–18:00, closed Sundays and holidays; the market restaurants run to midnight Monday to Saturday. Go in the morning for the produce floor, later for the food counters.
Serralves
Contemporary art museum, the 1930s Art Deco Serralves Villa, the Casa do Cinema devoted to Manoel de Oliveira, and a large park with sculpture, all on one ticketed site west of the centre. Allow half a day and check which buildings are included in the ticket you buy.