Appian Way and the ruins of the Claudian Aqueduct.  The Appian Way was a military road, built as far as possible in a straight line, cutting through hills and bridging ravines.  It was constructed somewhat like our macadam roads, with a pavement of hard stone resting on several layers of smaller stones set in cement.  The Claudian aqueduct was one of several conduits which carried water from mountain springs to Rome.  Built between A.D. 38 and A.D. 52, it was a wonderful piece of engineering, the water being carried for miles in a cement-lined channel at the top of great arches of stone masonry, some of which are still standing. Click here to enlarge.