This area of extraction of the Pietra di Finale consists of three large quarries in the tunnel, an extractive area in the open wall and other smaller ones, cut on detachment boulders or small walls. In spite of the name "Roman cave" by which it is known, the site is actually of an uncertain period. Inside the quarries, clear traces of a pre-industrial extraction technique can be distinguished that cannot be easily dated, as it remained unchanged from the Roman era until the early decades of the twentieth century. However, it is possible to hypothesize that the material used for the construction of the bridges came from these quarries.