Castellammare di Stabia - Water spa and wellness Terme Stabiane The Stabian Baths were built around the 19th century at the behest of King Francis I of Bourbon. On the initial project of the architect Catello Troiano, the spa complex was expanded by the architect Ranireri who built two more new pavilions. The radical modification took place by the architect Eugenio Cosenza who gave the building a decidedly Art Nouveau style.