St. Galgano was a 12th-century saint who renounced his past as a knight to become a hermit. Lacking a cross to display, he created his own by miraculously burying his sword up to its hilt in a stone, a la King Arthur, but in reverse. After his death, a large Cistercian monastery complex grew. Today, all you'll see is the roofless, ruined abbey and, on a nearby hill, the Chapel of San Galgano with its fascinating dome and sword in the stone.