obidos aqueduct or aqueduto de obidos in portugal, ancient stone masonry building, over 3 km-long

obidos portugal aqueduct arch water column historic architecture travel landmark ancient old europe historical medieval stone history tourism portuguese landscape heritage european town day culture view wall building cultural monument ruin columns sky arches city construction antique castle outdoors destination cityscape attraction exterior structure tower aqueduto masonry km-long km-long built catherine austria 1570