Monticiano stands on a hill overloooking the Merse river. It is surrounded by century-old oak and chestnut trees. It is located not too far from the Abbey of San Galgano in Chiusino.
In the village you can admire the church of Sant'Agostino with the chapter room of the former monastery frescoed by Bartolo di Fredi, Guidoriccio Cozzarelli and Giovanni di Bartolo di Fredi , Guidoriccio Cozzarelli e Giovanni di Paolo. In Gothic style it is one of the Augustinian order's oldest hermitages. Worth seeing are the locality of San Lorenzo a Merse with the ancient castle and the Romanesque church; the hamlet of Castello di Tocchi; the ruins of the Castellaccio, Monte Quoio and Renna.