Wikipedia:<br>The Ponte Altinate is a Roman segmental arch bridge in Padua (Italy). The late Republican bridge once crossed a side arm of the Brenta, which del Ponti Romani is today heaped up to the street Riviera. The building is located at the junction to the via Altinate, completely sealed by the modern road surface.
 
 The ratio is 4:1 for the main arch and 3.7: 1 for the side arches; the ratio is between clear span and Pier thickness 5:1 [1]
 
 Also located below the modern street level which is near Ponte San Lorenzo, which is underground but accessible and is open to visitors at certain times of the opening.