Perched on a hill overlooking the highway east of Marsiliana are the ruins of the Stachilagi Castle. Built in the 13th century on the site of an older Roman fortification owned by the abbey of the Three Fountains of Rome, it was owned by the powerful Baschi family during the 14th century before surrendering it to counts of Orvieto, then Siena, and finally the Grand Duchy of Tuscany.

The Baschi family, however, are fascinating. They owned many castles and lands throughout Tuscany, Umbria and Le Marche in the middle ages, and held numerous powerful and prestigious military and civil offices, but were mostly famous for the feuds, battles, and outright hatred between the various brothers and branches of the family which only ended after intervention and mediation by Saint Francis of Assisi in 1218, which so impressed three warring brothers that they gave him a castle and one of them became a monk.