I took this photo of the Arrábida Bridge (of which more later) from the road above the north bank of the River Douro before we found the starting point for the boat trip:-
And I took this zoom from the bank itself:-
River bank buildings hard by the Dom Luís I Bridge:-
Other river bank buildings:-
Heritage Tram, Porto:-
This bridge seemed to take a road out over the river,* presumably because the houses were right on the bank and allowed no room:-
Cable cars. They seemed to come down from near the Dom Luís I Bridge:-
*Edited to add:- it’s called the Viaduto do Caias das Pedras.