Castel del Monte, built by Holy Roman Emperor Frederick II of Hohenstaufen, UNESCO World Heritage Site, Apulia, Puglia, Italy, Europe

apulia architecture attraction attractions bastion bastions building buildings built by castel castle castles day daylight daytime del during emperor europe european exterior exteriors famous fortification fortifications fortress fortresses frederick heritage hohenstaufen holy ii italian italy known monte nobody octagonal of outdoor palace palaces photo photos puglia renowned roman seeing shot shots sight sights site site sites sites south southern stronghold strongholds the tourist unesco well well known world worth