The source dating from the early twentieth century is built in Art Nouveau style, of which only the entrance portal remains. In fact, in the 1960s the building was completely renovated. Its name is that of the pope who, along with the great Michelangelo, was a great frequenter of the therapeutic waters. The water can be drunk from the numerous fountains as you walk among the historic chestnut woods of a 80-hectare park. Next to the fountains and the clinics, there are leisure facilities for guests: bar, coffee, concert, multi-purpose rooms.