Porta Nigra, a large Roman city gate, Trier, Rhineland-Palatinate, Germany, Europe

aged architectural architecture being beings building buildings city conveyance cultural day daylight daytime during europe european exterior exteriors famous federal freestone frg gate gates german germany heritage historic historical history human humans known landmark landmarks large monument monuments nigra of old outdoor palatinate passenger passengers people person persons photo photos porta portal portals renowned republic rhineland rhineland palatinate roman roman romans sandstone seeing shot shots sight sights site sites small stone stony the tour tourism touristic touristical touristically touristy tours town train trains transport transportation trier unesco urban view views well well known world worth