Italy sits on more volcanic and geothermal activity than any country in Western Europe. The Romans built thermae on every hot spring they found. Many of those springs are still flowing, still hot, and in several spectacular cases, still free. From Saturnia's travertine cascades (37°C, open 24 hours, zero fee) to Ischia's Sorgeto Bay (volcanic water bubbling into the sea) to Bagno Vignoni's surreal piazza-pool (a Renaissance square where the central feature is a steaming thermal basin instead of a fountain), Italy has thermal experiences that range from €0 to €200/day — and the free ones are often the best.
Plan my thermal trip →Cascate del Mulino, Saturnia (Tuscany) — the king. 37°C sulfurous water cascading over natural travertine pools. Open 24 hours. No ticket. Bring a towel, bring wine, go at midnight. GPS: 42.6485°N, 11.5137°E.
Sorgeto Bay, Ischia — volcanic water bubbles into the sea. Mix your own temperature. 234 steps down from Panza village. Stunning at sunset.
Terme di Petriolo (Tuscany) — 43°C water in a river gorge near Siena. Wild, free, no facilities. The medieval bridge above adds drama. GPS: 43.0667°N, 11.2833°E.
Bagni San Filippo (Tuscany) — "Balena Bianca" (White Whale) — white calcium formations in a forest stream. Warm pools in a fairytale setting. Free.
Terme di Sirmione (Lake Garda) — from €22. Thermal water at 69°C (cooled for pools) on a peninsula jutting into the lake. The Aquaria spa (€54) has outdoor pools overlooking Garda. Jamaica Beach nearby has free thermal water seeping into the lake from underwater springs.
Poseidon Gardens, Ischia — €38/day. 22 thermal pools at different temperatures descending to a private beach. The most complete thermal park in Italy.
Abano & Montegrotto Terme (Padova) — Europe's largest thermal area. Volcanic mud treatments since Roman times. €30-80/session. Hotels with private thermal pools from €90/night.
Bagno Vignoni (Val d'Orcia) — the pool-piazza. You can't swim in the central basin (historic monument), but the Terme Libere below the village and Posta Marcucci hotel pool (€25/day for non-guests) offer the same thermal water with Val d'Orcia views.