The most attractive part of Porto for tourists is the area along the Douro River downstream from the Ponte D Luís I bridge, the iron bridge built by Teófilo Seyrig, one of Gustavo Eiffel’s students.
On the north bank of the river runs the Cais da Ribeira, Porto’s riverfront which is full of bars and restaurants, and along the south bank is the Cais da Vila Nova di Gaia, where the big port wine producing companies have their famous cellars giving visitors the opportunity to indulge in some wine tasting.
There are plenty of companies offering cruises on the river, and it is worth going on a short trip to check out the six bridges crossing the Douro.