Bagno Vignoni is a small Italian village and hamlet of San Quirico d'Orcia on a hill above the Val d'Orcia. It's well known for its hot springs. Because of its location on Via Francigena, the main pilgrim route from France to Rome, Bagno Vignoni had become a popular resort and vacation destination.
At the heart of the village, there's the "Square of sources," a rectangular tank from the 16th century that contains the original source of water that comes from the subterranean aquifer of volcanic origins. Cinephiles would probably remember the tank from Tarkovsky Nostalghia.