Its structure is an imitation of Medieval Moslem baths, and its existence has been documented from the 12th century. It has a rectangular layout, and behind the entrance door is the apodyterium, or changing room, and an octagonal pool. A small room gives onto the frigidarium, or cold room, which in turn leads into the warm room or tepidarium. Rather less well conserved is the caldarium, which were been the hot steam baths. The building is situated in the Capuchin convent.