The fortress of San Leo is a very old one and on the border of the regions of the Marche and Romagna, central Italy. The area where it's situated is full of peaks rising from the sea cliffs, with the occasional ruins of a castle or fort. The first fortification of San Leo was built as early as the antiquity - by the Romans, and in the Middle Ages already it was fought over by many peoples, among them the Byzantines, Goths, Franks and Lombards. In 16th century, it was in the possession of Cesare Borgia, and it was also, at one point in time, one of the palaces owned by Federico da Montefeltro and his wife Battista Sforza. There's an interesting museum today!