After exactly 1.1km, you’ll come across a minor road on the left indicated by a yellow sign for Castel di Pietra. Taking the short detour (3 + 3km) to the castle is highly recommended: after a 2.3km stretch along the gravelled track flanked by cypress trees, turn right, cycling uphill for 700m until you reach the medieval fortress. Dismount here and walk up to the castle ruins on the top of the hill. From here, retrace the route back to the tarmac road. Continuing the route, cycle for 2.5km until you reach the junction where you’ll need to bear right, following the signs for Lago dell’Accesa.