archaeological park in xanten, arches of the roman amphitheatre, north rhine-westphalia, germany

archaeologischer rhinewestphalia archaeological amphitheatre amphitheater architecture civilization constructed foundations archaeology destination niederrhein settlement westphalia flagstones inferioris fortified frontiers germaniae limestone rhineland original heritage circular cultural historic imposing pavement germany regular partial replica colonia traiana ancient arcades borders columns culture emperor harbour history pattern tourism tourist trajana western xanten arches unesco empire europe trajan travel roman north ulpia world