roman amphitheatre in archaeological park, xanten, unesco world heritage site, lower rhine, germany

amphitheater amphitheatre apx arcades archaeological archaeologischer archaeology arches architecture border borders brick circular city colonia columns constructed cultural destination emperor empire europe flagstones fortified foundations frontier frontiers german germaniae germanic germany harbour have heritage historic history imposing inferioris limes limestone lower niederrhein north original park partial pattern pavement regular replica rhine rhineland rhinewestphalia roman round settlement site stone tourism tourist town traiana trajan trajana travel ulpia unesco west western westphalia world xanten