Roman city gate, Porta Nigra, UNESCO World Heritage Site, Trier, Mosel Valley, Rhineland-Palatinate, Germany, Europe

travel destination photography square colour image square image outdoors city day building exterior architecture roman city gate porta nigra unesco world heritage site trier mosel valley rhineland palatinate germany europe roman ruin old history the past facade arch clear sky stone incidental people flower gate unesco national landmark german culture colour color image color outside tourist destination travel architectural landmark background people people in the background historical historic heritage cultural culture unesco world heritage sites world heritage site world heritage sites arches arched cities typically german german culture traditional culture tradition traditional traditionally german german european