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Bagno Vignoni has been famous since Roman times for the mildly sulfurous waters that come bubbling up into the large rectangular pool that forms the town's main square, Piazza delle Sorgenti (Square of the Springs). Medieval pilgrims and modern hikers alike have soothed their tired feet in the pleasantly warm water that flows through open channels on its way to the River Orcia. Of particular interest are the ruins of an 18th-century bathhouse on the edge of town and the Chapel of Saint Catherine, who, it seems, came here often.