Exterior, Curved RoofLine, and Glass Siding Material A  landmark in the city of Cologne, this distinctive department store helps many to orientate within it .The building’s curved front façade cantilevers subtly into the space of the pedestrian zone, strengthening the presence of Peek & Cloppenburg along this major pedestrian and shopping axis.  Photo 4 of 13 in 12 Renzo Piano Buildings We Love