© All Rights Reserved One of several impressive buildings that form the street corners on Porto's Avenida dos Aliados. The Avenida is considered the proper centre of Porto and is overlooked by the town hallRelated images River Douro View from Ribeira to Arrabida - Porto Red Rooftops in Porto View of Porto from Clerigos Tower Rua de Santa Catarina - Porto Art Nouveau in Porto Porto - Palacio do Bolsa and Igreja de Sao Francisco