The extraordinary ancient site of Bagno Vignoni is tucked away 6km southeast of San Quirico. Its central square is entirely taken up by an arcaded Roman piscina, or open pool; the springs still bubble up at a steamy 51°C, with a backdrop of the Tuscan hills and Renaissance loggia – built by the Medici, who, like St Catherine of Siena, took the sulphur cure here. Bathing in the piscina itself is forbidden, but you can still take the waters at the sulphur springs below the village (30°C), or wallow in the mineral-rich waters of one of the nearby spas (advance booking necessary).

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