It sits on a hillside above the river Esarulo , a tributary of the Serchio .
Castiglione di Garfagnana is a medieval walled town and comune of 1,878 inhabitants in the province of Lucca .
Castiglione di Garfagnana sits on a hillside above the river Esarulo , a tributary of the Serchio .
Castiglione di Garfagnana is a medieval walled town and comune of 1,878 inhabitants in the province of Lucca .