Castel del Monte Castle, Hohenstaufen Emperor Frederick II, UNESCO World Heritage Site, Province of Barletta-Andria-Trani, Puglia, Italy, Europe

apulia attractions attraction barletta andria trani province bastions bastion buildings building castel del monte castell castelo castel castles castle construction cultural monuments cultural monument cultural sites cultural site defence works defence work defense facility defensive fortification defensive work deserted emperors emperor empty europe's europe famous place fort castle fortifications fortification fortresses fortress fort frederick ii holy roman emperor frederick ii friedrich ii heritages heritage historical historic italy landmark mediaeval medieval nobody no one no people place of interest puglia sight southern europe southern italy south europe south of italy structure tourist attractions tourist attraction tourist landmark travel photography unesco site unesco world heritage sites unesco world heritage site unesco world heritage unesco world hertiage site unesco world site unesco uninhabited world heritage site world heritage