Visconti Bridge

The Visconti Bridge at Valeggio sul Mincio is a medieval viaduct over the Mincio River built at the end of the 14th century by Gian Galeazzo Visconti, Duke of Milan. Initially conceived as a fortified dam to divert the Mincio water flowing to Mantua, it has served as a bridge since then. Today, the ruined central span over the Mincio is replaced by a steel structure.

Source: Wikipedia