San Giovanni Bianco is a village with the most visible changes of road conditions of the valley thanks to the bridges. The Old Bridge is the most ancient bridge of San Giovanni Bianco.
It is a bridge from the 15th century, along which was passing the Via Mercatorum (merchants’ road) connecting Bergamo with Valtellina and going down to the lower Seriana Valley, joining some of the most important centres of the valley, such as Serina, Dossena and Cornello.
The Via Mercatorum was substituted at the end of the 16th century by a new road: The Strada Priula. This road used to connect Bergamo and Valtellina, crossing the valley bottom up to Passo San Marco.
In San Giovanni Bianco, the Strada Priula was passing across the bridge with an arch that still today connects the banks of the creek Enna to the height of the Boselli Palace, crossway of the three roads.