it stands as a symbol of roman ingen eenious.his was one mapped by british archeologists, thomas ashby, who drew the map of the waterways in the 1920s. a starting point for today's archeologists. >> translation: ashby travelled on foot all over, asking locals and farmers for signs. aqueducts. we are continuing his work with the help of modern technology, tracking back 2,000 years of history. >> a history that runs through the backbones of the roman empire. fight. >> our digital producer is here. wa j.