I first visited Porto for one reason...the Lello Livraria. Nothing to do with Harry Potter ...it was listed as one of the top ten bookshops of the world. When my daughter and I visited, there was no entry fee,there was hardly anyone there and we sat down in the little coffee area, had a terrible coffee and i soaked in the ambience while my daughter took photos. I loved the stained glass ceiling and the ornate staircase. This was January 2015. Porto is one of my favorite European cities as is Lisbon. That blue-tiled church was pretty spectacular too.