The central square features a large medieval pool, into which water flows from the hot spring as steam gently shrouds the entire structure. Over time, this fairy-tale atmosphere has amazed famous travellers such as Pope Pius II, Lorenzo the Magnificent, Dickens and D’Annunzio. The pool is surrounded by Renaissance buildings built by Rossellino, and the beautiful Loggia of St. Catherine of Siena, giving the whole square a touch of true elegance.
The water from the bath flows to the nearby cliff, which features ancient underground mills and storage tanks that were formerly used as a public spa. The other spas built in this small village are fed by other water flows. The whole area is surrounded by picturesque countryside that lends itself very well to a nice walk along the marked trails.