Terme libere di Bagno Vignoni (Parco dei Mulini)

What to expect

Bagno Vignoni is a tiny medieval village in the Val d’Orcia, a hamlet of San Quirico d’Orcia in the province of Siena. Its centre is not a square but a pool: the Piazza delle Sorgenti, a rectangular stone basin from the 16th century, filled by a hot spring and lined with old stone buildings. On cold days it steams. You cannot bathe in it.

The water does not stop there. It leaves the square and runs over the edge of the hill, down a steep slope of white travertine, into the Parco dei Mulini (Mill Park). Over centuries the mineral water has built up ledges, small falls and crusted channels on its way toward the Orcia river. Four medieval mills were cut into this slope, some carved into the rock and some partly underground. Visit Tuscany notes they were already mentioned in a charter of 1207. Because the thermal flow never dried up, they could grind grain in summer when the river mills in the area stood idle. Some of them kept working until the 1950s. One, the Mulino da Piedi, is now a ruin slowly being taken back by plants.

At the bottom of the park is a turquoise basin of warm water that people used for years as free baths. That is what most “terme libere di Bagno Vignoni” articles describe. The rules have changed. A mayoral ordinance now bans bathing in that basin, and a fence keeps people out, according to a guide updated in February 2026. What you can still do is sit beside the small cascade and let the warm water run over your feet and legs, or dip your feet in the old channels (gorelli) along the path.

So come for a walk, the mills, the views over the Orcia gorge and a warm foot soak. If you want to sit in hot water up to your shoulders, see the alternatives below.

The water

Visit Tuscany puts the spring at about 120°F49°C. Other sources describe it as bicarbonate, sulphate and calcium water with dissolved carbon dioxide, which explains the thick white deposits. By the time it has crossed the square and run through long open channels, it is much cooler. Expect warm water in the cascade and lukewarm water in the lower channels, varying with the season and the air temperature.

Getting there

Bagno Vignoni is just off the SR2 Via Cassia between Siena and Rome. Coming along the Cassia, turn up the Strada di Bagno Vignoni near the bridge over the Orcia. After about 400 m there is a roundabout with a large car park on the left. Park there or in the other lots around the edge of the village, and check the signs, since some are paid and some have time limits. Cars are not welcome in the tiny centre.

• From Siena: about 51 km (32 miles) south, roughly 70 minutes.
• From San Quirico d’Orcia: about 6 km (4 miles), about 10 minutes.

From the village, follow signs for the Parco dei Mulini. The path drops down the slope beside the channels to the lower basin and the cascade, a walk of a few minutes, but it is steep and uneven in places, so it does not suit wheelchairs or pushchairs.

Siena Mobilità buses link Bagno Vignoni with Siena station, Buonconvento and the other Val d’Orcia towns one to three times a day, depending on the route.

When to go

The park is open all year. Winter and early spring are the most atmospheric times: the cold air makes the water steam, and the square and the slope look their best at dawn. Summer days are hot and the village gets very busy with day trippers, so go early or late. The free foot soaks are best on a cool day, when warm water feels most welcome.

Rules and etiquette

• No bathing in the lower basin. It is fenced and covered by a mayoral ordinance. Do not climb the fence.
• No bathing in the Piazza delle Sorgenti pool. It is a monument, not a pool.
• Foot soaks only in the cascade and channels. Keep swimsuits for the spas.
• Stay on the paths. The travertine is fragile and the mills are ruins.
• Carry out your rubbish. There are no bins or facilities down the slope.

If you find signs on site that differ from this, follow the signs. The comune of San Quirico d’Orcia sets the rules.

Where to stay nearby

Bagno Vignoni has three thermal hotels, all paid: the spa hotel on the edge of the square (Albergo Le Terme, Piazza delle Sorgenti 13), the Terme Hotel La Posta with indoor and outdoor pools, and the Terme Hotel Adler with its salt grotto. Ask each about day passes for non-guests. There are also farm stays in the countryside around the village. San Quirico d’Orcia, Pienza (about 13 km away) and Castiglione d’Orcia (about 4 km) have more choice.

Safety notes

• Footing: wet travertine is slippery, and the path is steep. Wear shoes with grip.
• Water quality: this is open runoff that has crossed a village square. Keep your face out of it and do not drink it.
• Heat: the water near the top of the slope is warmer than at the bottom. Test before you put your feet in.
• Children: watch them closely near the drops along the mill channels.

Nearby stops worth adding

For a real free soak, Fosso Bianco at Bagni San Filippo is about 17 km (11 miles) south, around 20 minutes by car, with wild pools in a wooded stream. The Terme di Petriolo river pools are about 57 km (35 miles) to the north-west. For paid thermal pools in the area, Terme di Chianciano and Fonteverde at San Casciano dei Bagni are within an hour, and the Cascate del Mulino at Saturnia are a longer drive south-west. In the area, Pienza and Montalcino are both short drives away.