Porto City Hall anchors the top of Avenida dos Aliados with the kind of civic confidence that early 20th-century cities loved. Its granite facade, arcades, and tall central tower give the avenue a formal endpoint, while the square below remains one of Porto's main stages for gatherings, celebrations, and political life.
You will almost certainly pass it while walking between Trindade, Aliados, and the old centre. Pause rather than just crossing the traffic: the building helps explain the modern civic Porto that grew around banks, boulevards, and institutions, not only the steep medieval lanes by the river.