Three kilometres up the Isasco road from Varigotti, you will come to Isasco village - inhabited since ancient times. Once a Roman farmstead (Latin: fundus), dating back to the first century CE, Isasco was a small rural settlement which developed on flat terrain whose many springs rendered it especially suited to farming.
The remains of the roman Magnone bridge are situated in a thick woodland setting at around 290 m a.s.l. in proximity of the head of Val Ponci under San Giacomo where the precedent river basin was cut with the formation of the current Val Ponci fossil valley system.
The Val Ponci is a small valley in which a rural and enchanting naturalistic landscape is associated with five roman bridges that can be linked to the via Iulia Augusta road and are datable between the 1st and the beginning of the 2nd century A.D.