Castel del Monte (Castle of the Mount) is situated on a solitary hill, in the southeast italian region of Apulia, near Andria in the province of Bari. It was built in the 13th century during the reign of the Holy Roman Emperor Frederick II. The castle is an octagonal prism with an octagonal bastion at each corner. Each floor has 8 rooms and an octagonal courtyard in its centre. From 1996 is a Worl.