Once in Buja it is possible to climb its highest hill, called "Monte". Inside the historic village of San Lorenzo, there is the parish church of the same name, one of the oldest and most distinguished in Friuli. Inside it is preserved, unique in the region, a complete cycle of frescoes dedicated to the Madonna. The remains of the medieval castle are visible to the east of the hill.
Going north you reach Osoppo where, near the Town Hall, begins the climb that leads to the top of the hill on which the Fortress, a National Monument since 1923, is located. Witness to various military events that took place over the centuries, the fort is characterized by the presence of medieval and renaissance remains, as well as trenches, galleries and walkways dating back to the First World War.