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 gate large group of people men women full length rear view tourist tourism urban scene unesco national landmark german culture colour color image color outside tourist destination travel architectural landmark group 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 tourists holiday maker holiday makers on holiday