The ancient city on the banks of the Douro River is striking in its picturesqueness; during sightseeing excursions, tourists cannot resist taking photos of its bridges, towers, and squares. It is difficult to say what the guests of Porto like best: the bright houses of the Ribeira quarter, the grandeur of the cathedral, the austere beauty of the Stock Exchange Palace, or the Clérigos tower piercing the sky because all these sights are equally beautiful. Experienced guides must include an excursion to two extraordinary buildings - the Chapel das Almas and the Lello bookstore - in the excursion program in English. The chapel has gained worldwide fame for the panel of traditional blue and white azulejo tiles covering its walls; the store is interesting for its facade and Art Deco interior.