Pont del Diable is the popular Spanish name of the Roman aqueduct of Tarragona, capitol of the province of the same name.
The aqueduct is found 3km from the city and brought fresh water from the Francoli River. It’s a grandiose structure from the era of Trajan and has two levels of arches. The lower level has 31 arches and measures 63 meters in length, while the upper lever consists of 25 arches and measures 217 meters in length.
On the A-7 highway, there’s a place where you can park on either side of the highway and then reach the aqueduct by foot. It’s a nice walk and a worthwhile one at that. The Aqueduct of Tarragona was declared a National Historical Monument in 1905.