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Mosaic floor, Byzantine Church, hill top palace complex, Masada fortress, UNESCO World Heritage Site, Israel, Middle East

Amboise Gate, Grand Master's Palace, City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

The Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

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

Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Palace of the Popes, UNESCO, Avignon, Rhone Valley, Grand Avignon, Vaucluse, Provence-Alpes-Cote d'Azur, France

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Defensive walls and ramparts with view over surrounding countryside from the Castle of Terena, a listed national monument, Terena, Alentejo Central, Portugal, Europe

Aerial image of Arundel Castle, a restored medieval castle, South Downs, Arundel, West Sussex, England, United Kingdom, Europe

Holly Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

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

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

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

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

Ladies gallery, historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe

Metal staircase climbing to rock palace fortress, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Majestic ancient castle on a hill with clear blue sky, showcasing historical architecture and heritage, Northumberland, England, United Kingdom, Europe

Aerial image of the Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Majestic medieval castle with stone bridge over a river, surrounded by wild nature under a cloudy sky, Eilean Donan, Dornie, Scotland, United Kingdom, Europe

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

View of water gardens from summit of Sigiriya Lion Rock Fortress, UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

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

Inside Kasbah Ait Ben Haddou, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Monastery of St. John the Theologian, fortress and Hora, UNESCO World Heritage Site, Skala, Patmos, Dodecanese, Greek Islands, Greece, Europe