Castel del Monte is an imposing castle that dominates the Murge in a short distance from Bari. The castle was built by Frederick II of Swabia in the XIII century and today is considered a brilliant example of medieval architecture with styles ranging from the Roman to the Gothic classic up to the delicate subtleties of the Islamic mosaics. To the end of its construction Castel del Monte became the seat of the court of Frederick II, who was elected ruler of the Kingdom of Sicily at the age of three years. The castle was designed with a strict plan and inspired by the number eight in order to create symmetry of light in the days of solstice and equinox, concepts and symbolism that have intrigued scholars for centuries, leaving to visitors that enigmatic flavor given by these arguments. Eight are the sides of the plant of the Castle, eight rooms on the ground floor and on first floor (trapezoidal) arranged to form an octagon, and eight are the imposing towers, of course octagonal, arranged on each of the eight corners. Made up of mixed limestone quartz with facades scratched by single windows to the first floor and mullioned windows on the second floor. The entrance mimics the shape of a triumphal arch defined as a kind of prelude to the Renaissance.