The story of this place
Built around 1240 by Emperor Frederick II, the extraordinary Castel del Monte crowns a lonely Apulian hill in a perfect octagonal plan, with an octagonal tower at each of its eight corners and an octagonal courtyard at its heart—the number eight repeated obsessively. Frederick, a brilliant, freethinking ruler dubbed 'stupor mundi' (wonder of the world), fused Gothic, classical, and Islamic influences into a design of striking geometric harmony. Its purpose baffles scholars: it has no moat, drawbridge, or defensive features of a true fortress, yet no clear royal apartments either. Theories range from a hunting lodge to an astronomical instrument to a coded monument of medieval science and mathematics. It appears on the Italian one-cent euro coin.