xanten roman archaeological park unesco world heritage site with harbor temple, lower rhine, germany

archaeological archaeologischer archaeology border borders colonia columns constructed emperor empire europe fortified foundations frontier frontiers german germanic germaniae germany harbor harbour heritage historic history imposing inferioris limes limestone lorraine lower niederrhein nordrhein nordrheinwestfalen north original park partial replica rhine rhineland rhinewestphalia roman settlement site sky soaring temple town traiana trajan trajana ulpia unesco west western westfalen westphalia world xanten germany