Porta Nigra, Trier on Mosel, Rhineland-Palatinate, Germany, Europe

unesco world cultural heritage sight people city facade opposite nature clouds building exterior travel mosel outdoors rhineland palatinate city traffic difference germany person architecture public transportation europe transportation roman unesco cloud tram incidental people landmark people in the background rheinland pfalz urban scene cable car day sky landmark porta nigra blue sky trier local landmark streetcar outdoor photography day architecture summer town tourists' train porta nigra roman town gate trier rhineland palatinate germany europe