My though exactly while crossing the River Duoro on Dom Luis I bridge in Porto, as well as in Lisbon and Sintra.
Is advised to always look ahead, literally and in life. When you are on this particular bridge, look also down. The view might surprise you.
Since Porto is the house to the Porto wines, you must cross the River Duoro to Vila Nova de Gaia to visit the wine lodges and also have a different perspective on the city.
There is something about Portugal! I think I need to plan my return.