They say this spa was known by the Etruscans and was widely used by the Romans, as attested by the plaque on the porch of Santa Catalina church. It is also said that these waters were consecrated to the nymphs. These baths were very popular in medieval times, due to its proximity to the Via Francigena, which linked Europe with northern Italy. Vignoni's thermal waters were used for personal hygiene and to treat many diseases. The thermal waters have a temperature of approximately 49 ° and sulfur bicarbonate make it very suitable for skin problems. The Baths were equipped with a gallery or porch, where the sick could shelter from the unmerciful weather with divided areas for men and women.