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Photo: Guinness323, CC0 via Wikimedia Commons
It's an old bookshop with an amazing interior and spiral staircase. Voted as one of the most beautiful bookshops in Europe. Be warned that it can get incredibly crowded and claustrophobic.
The Livraria Lello & Irmão, commonly known in English as the Lello Bookshop, is a bookshop located in the civil parish of Cedofeita, Santo Ildefonso, Sé, Miragaia, São Nicolau e Vitória, in the northern Portuguese municipality of Porto.
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Clerics' Tower
Panoramic views from this baroque tower. 226 steps to the top. It is best to get there early since there is not a lot of space on the viewing platform. You might even have to wait for some time before you are allowed to climb up the stairs.
Portuguese Photography Museum
Housed in a beautiful building in the centre of the city.
Porto Cathedral
This Romanesque cathedral was built in the 13th century. Later on Baroque alterations were made in the 17th and 18th century. The cathedral is on top of a hill from where you also have great views over the city and the river.
A small exhibition about Port wine and its certification process. Samples of a small variety of Port wines can be bought. Guided tastings and tours to the laboratories can be arranged.