Now look at the architecture, because each period left its own layer. The Gothic tower was added between 1407 and 1414. The Renaissance loggia followed between 1569 and 1573, and its arcaded style contrasts sharply with the Gothic parts of the complex. The Spanish building, standing on Rathausplatz but not directly connected to the main structure, dates from 1660 and 1661. The tower is crowded with sculptures. Figures of Cologne personalities such as Johann Maria Farina, the founder of the world's oldest perfume factory, appear alongside Wallraf, Mevissen, Adenauer, Ostermann and Haubrich across three floors. Patron saints watch over the city from the top floor, among them Peter, the Three Wise Men, Gereon, Ursula, Severin and Albertus Magnus. Look for the Platzjabbeck, a figure that has adorned the tower since the fifteenth century. Some of the sculptures are witty or thought-provoking. And if you hear bells, listen closely. Between 9 a.m. and 6 p.m. every day, a carillon of 48 bronze bells plays from the tower. The guilds donated them in 1958, as successors to the medieval guilds, after the earlier bells were destroyed in the Second World War. Konrad Adenauer donated one bell himself.