Saturnia, Tuscany
Must-DoIconicThe most famous hot springs in Italy — sulphurous water cascades over travertine terraces in the open countryside. The Cascate del Mulino is free, open 24/7, and absolutely magical at sunrise or under stars. The adjacent Terme di Saturnia spa is upscale.
Terme di Sirmione, Lake Garda
Must-DoOne of Italy's most therapeutic waters — hot sulphurous springs emerging directly into Lake Garda. Aquaria Thermal SPA has lakeside pools and treatments. Catullo Spa is the medical wellness option. Sirmione town itself is gorgeous.
Ischia (multiple sites)
Must-DoThe "Island of Thermal Parks" — Poseidon, Negombo, and Castiglione offer outdoor thermal pools set in tropical gardens by the sea. Each has 15–20 pools at different temperatures. Ischia has more thermal water than any island on Earth.
Bagni San Filippo, Tuscany
Hidden GemBudgetA wild thermal river in the Val d'Orcia forest — white calcium deposits form natural pools and a "Whale" formation. Free, uncrowded on weekdays, and utterly beautiful. The water is among the hottest wild springs in Italy.
Bormio Terme, Lombardy
Must-DoAlpine thermal baths at 1,225m elevation — soak in outdoor pools while snow falls on the mountains around you. The Bagni Vecchi (old baths) date from Roman times and have an atmospheric cave pool. Perfect après-ski.
Terme dei Papi, Viterbo
Hidden GemAn enormous hot pool 80 km north of Rome — popular with Romans but almost unknown to tourists. The name ("Baths of the Popes") tells you who used to soak here. Budget-friendly and open late.
Our pick
Saturnia's wild cascades for the iconic Italian thermal experience. Ischia for a full thermal holiday. Bormio for a winter mountain soak.