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These are the “wild ones” of Tuscany’s hot springs. San Filippo, hidden in the woods of Monte Amiata, has an enormous white mineral wall, and natural pools of frothy, steaming water (where temperatures are over 100 degrees). Petriolo, near Siena, isn’t quite as hot—but it’s every bit as lovely, with a series of small natural pools, cascades, and a half moon-shaped pond.

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San Filippo and Petriolo

These are the “wild ones” of Tuscany’s hot springs. San Filippo, hidden in the woods of Monte Amiata, has an enormous white mineral wall, and natural pools of frothy, steaming water (where temperatures are over 100 degrees). Petriolo, near Siena, isn’t quite as hot—but it’s every bit as lovely, with a series of small natural pools, cascades, and a half moon-shaped pond.