The geologic history of the territory of the Val d'Orcia has begun 5 million years ago when in the zone there was the volcano of Amiata.
Its activity has produced porous rocks that allow the waters rain to penetrate in deep underground and come uot below towards the valley by thousand sources and brooks that feed the secular woods of firs, beech trees and chestnut trees
Part of the waters undergruond comes to contact with the residual volcanic activity of the Mountain and for this reason there are a lot of thermal sources with waters rich in calcium, sulphur etc.
Thermal baths of Bagno Vignoni:
The name of this ancient suburb derives from the castle of Vignoni that dominates the hill above the suburb.
Around a great rectangular tub, into which come up the termal waters, there are the residences, the inns, the church of St. Giovanni Battista and the Santa Caterina's portico.
Besides Saint Caterina from Siena also other characters of the time have enjoyed of its thermal waters as Pope Pio II Piccolomini, Lorenzo il Magnifico , the Granduca Cosimo III etc.
Thermal baths of Bagno San Filippo
Center thermal place to 524 mt height on the slopes of the Amiata Mountain.
Its thermal waters sulfuree and rich of carbonate of calcium going down to valley gives life to the "Fosso Bianco" with falls and "gore" of limestone.
The recoveries of Roman necropolises testify as the place it was already known in the I° and II° sec. D. C.
The thermal baths were frequented by the Medici with Lorenzo il Magnifico, the Granduca Ferdinando etc.. so much that the Macchiavelli in the "Mandragola" it recommends "… to take baths to St. Phillippo...".
The Thermal Bagni di Saturnia:
Famous for its falls of white stones
The thermal baths of San Casciano Bagni
with his most refined search of comfort