Cascate del Mulino, Saturnia
Must-DoIconicTravertine terraces carved by millennia of hot water, steaming in the open Maremma countryside. Free, 24/7 access. The most Instagrammed hot spring in Italy — and it lives up to every photo. Bring a towel; there's nothing else there.
Bagno Vignoni
Must-DoA medieval village built around a thermal pool instead of a piazza. The pool itself is historic (no swimming), but the free foot-soaking terrace below and the nearby Parco dei Mulini wild pools are wonderful. Adler Spa hotel for luxury.
Bagni San Filippo
Must-DoBudgetA white calcium "whale" formation in the forest with natural hot pools below it. The hottest wild spring in Tuscany. Follow the trail from the village car park (10 min walk). Free and relatively uncrowded.
Terme di Petriolo
Hidden GemBudgetHot water flows directly into the Farma river — swim in the wild where hot meets cold. Between Siena and Grosseto. The medieval bath ruins on the bank add atmosphere. A true Tuscan secret.
Terme di Saturnia Spa Resort
LuxuryThe luxury spa next to the wild cascades — a 4-pool complex, Roman bath cave, and wellness centre. The resort is 5-star with golf and restaurants. Day passes available but book ahead. A different world from the free cascades.
Our pick
Cascate del Mulino at dawn is one of Italy's most magical moments. Pair it with Bagni San Filippo on the same day for a Tuscan thermal double.