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The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

The Couesnon River leading to the island of Mont Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Aerial image of Piel Castle (Fouldry Castle) (Fouldrey Castle), a concentric medieval fortification with a keep and three towers, Piel Island, Furness Peninsula, Barrow in Furness, Cumbria, England, United Kingdom, Europe

A storm passes behind Bamburgh Castle with the last light of the day illuminating the rocky shoreline and castle, Northumberland, England, United Kingdom, Europe

Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe

Flowers frame old mystical buildings of Romanesque Gothic and Renaissance style, Quinta da Regaleira, Sintra, Portugal, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Looking across the calm waters of Havana Bay to Havana with the 16th century fortress, Morro Castle, standing guard, Havana, Cuba, West Indies, Caribbean, Central America

View from Mirador de San Nicolas to The Alhambra, UNESCO, Mudejar architecture, Granada, Andalusia, Spain

The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe

Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

The 13th century medieval castle and gardens in Marvao, built by King Dinis, Marvao, Alentejo, Portugal, Europe

The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe

Caernarfon Castle at night, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

Fagaras Citadel and Romanian Orthodox Cathedral in background, Fagaras, Transylvania, Romania, Europe

Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe

Mont St. Michel, UNESCO World Heritage Site, holy island and peninsula at sunset, Normandy, France, Europe

Mont St Michel, UNESCO World Heritage Site, holy island and peninsula at dusk, Normandy, France, Europe