On the slopes of the Morrone Mountain lies Popoli, a town of about 6000 inhabitants, built as a fief in the 13th century. The thermal waters, which abound and have been known since antiquity, were treated and have been systematically used since the 19th century when the first spa was built. Today only ruins remain of the spa because of damage from WWII. The new spa, located in a beautiful 6 hectare park, uses the sulphuric waters and muds especially for the treatment of respiratory problems.