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

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

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

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

Snow covered Old Town with towers of Glockenspiel, Dom and Franziskanerkirche churches dominated by the fortress of Festung Hohensalzburg at twilight, Salzburg, Austria, Europe

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

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

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

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Old Town with towers of Glockenspiel, Dom and Franziskanerkirche churches dominated by the fortress of Festung Hohensalzburg at twilight, Salzburg, Austria, 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

View along the restored section of the Great Wall, UNESCO World Heritage Site, Mutianyu, near Beijing, China, Asia

View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Cathedral and Palazzo Ducale seen from the Albornoz Fortress, Old Town, UNESCO World Heritage Site, Urbino, Marche, Italy, Europe

Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Fortification on top of Puig de St. Maria, Pollenca, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

The hilltop castle at Carreg Cennen in the Brecon Beacons, Llandeilo, Carmarthenshire, Wales, United Kingdom, Europe

Bamburgh Castle, a hilltop fortress constructed on top of a craggy outcrop of volcanic dolerite, Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe

View of Kavala Fortress from ferry, Kavala, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Greece, Europe

View from the Citadel of Namur of Namur, a city and municipality, capital of the province of Namur and Wallonia,Namur, Wallonia, Belgium

Cathedral and Palazzo Ducale seen from the Albornoz Fortress, Old Town, UNESCO World Heritage Site, Urbino, Marche, Italy, Europe

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Eltz medieval historic castle in an autumn landscape with trees at sunrise, Wierschem, Rhineland-Palatinate, Germany, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

View of Kavala Fortress from ferry, Kavala, Dimos Kavalas, Eastern Macedonia and Thrace, Gulf of Thasos, Gulf of Kavala, Greece, Europe

Bamburgh Castle, a hilltop fortress and Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Rumli Hisar (Rumelian Castle) (Rumelihisari) hilltop 15th century fortress with multiple towers, walking paths and water views, Istanbul, Turkey, Europe

Hiker on the access path to Tsakhats Kar Monastery with the Smbataberd fortress in the background, near Yeghegnadzor, Vayots Dzor province, Armenia, Eurasia

Bosa city colorful buildings with castle on top of the hill and Vecchio bridge crossing Temo river, Bosa, Sardinia, Italy, Mediterranean, Europe

Lycian sarcophagus and castle, Simena (Kalekoy), Kekova, Lycia, Antalya, Mediterranean Coast, Southwest Turkey, Anatolia, Turkey, Asia Minor, Eurasia

Qalaat Ibn Maan, 17th century Arab Castle overlooking the Graeco-Roman city, Palmyra, Syria, Middle East

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

View of pastel coloured villas and Sant'Elmo Castle from Rotonda Diaz, Naples, Campania, Italy, Europe

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia