The Abbey of Saint Galgano was a Cistercian Monastery founded in the valley of the river Merse between the towns of Chiusdino and Monticiano, in Presently, the roofless walls of the Gothic style 13th-century Abbey church still stand. Nearby are the chapel or Eremo or Rotonda di Montesiepi (1185), the tomb of Saint Galgano and the purported site of his death in 1181, a sword said to have been driven into a stone by Galgano, and a chapel with frescoes by Ambrogio Lorenzetti.