Declared Common Heritage of Mankind by UNESCO in 1996, it was built by Frederick II of Swabia in 1240 on the Murgia highland, at a height of 540 metres above sea level.
The fortress is a very beautiful example of a Medieval building having a characteristic octagonal shape which joins together, different architectural styles ranging between the romanesque one and the classical art, up to the influence of elements of the Arabic and Islamic art.
Every year the castle is visited by a big number of visitors, attracted by the charming intrigue of symbolic elements and legends in which it is enveloped, so that it was considered to be a temple of learning, in which sciences were taught, or even an astronomical observatory or the custodian of the Sacred Graal.
The building is made from limestone with white marble decorations and a marble material of a colour similar to coral, called breccia corallina (marmor sagarium), and is made up with two floors with a total number of 16 big rooms (8 for each floor) which give you the impression of finding yourself in a kind of labyrinth. The towers  on the corners of the building are also octagonal shaped and also the central courtyard is octagonal shaped. Everything reminds to number 8, which has got a big symbolic value and which, if it is put in the horizontal position, symbolizes the infinite.

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