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Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East

Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

Castell de Bellver, a 14th century castle, Palma de Mallorca, Mallorca (Majorca), Balearic Islands, Spain, Mediterranean, Europe

San Carlos de Borromeo Castle, Pampatar City, Isla Margarita, Nueva Esparta State, Venezuela, South America

San Carlos de Borromeo Castle, Pampatar City, Isla Margarita, Nueva Esparta State, Venezuela, South America

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 Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe

Aerial image of the Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Frederiksborg Slot Castle built in the 17th century for King Christian 4th on Castle Lake, Hillerod, Zealand, Denmark, Scandinavia, 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

Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

Long exposure to record motion in the sea as it washes around black basalt boulders on a beach at Embleton Bay with the silhouette of Dunstanburgh Castle in the distance, Embleton Bay, near Alnwick, Northumberland, England, United Kingdom, 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

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

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

The walls and a guard turret in the medieval Fortezza, or castle, in Rethymnon, Crete, Greek Islands, Greece, Europe

The Mosque of Sultan Ibrahim within the Fortezza, or castle, in Rethymnon, Crete, Greek Islands, Greece, Europe

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

Wawel Castle, UNESCO World Heritage Site, reflected in the Vistula River, at sunrise, Krakow, Poland, 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

Doonagore Castle between the village of Doolin and the Cliffs of Moher on the County Clare coast, County Clare, Munster, Republic of Ireland, Europe

Fortified castle walls around the Convent of Christ (Convento de Cristo), UNESCO World Heritage Site, Tomar, Ribatejo, Portugal, Europe

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, 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

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