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Biertan Fortified Church, 15th century, UNESCO World Heritage Site, Biertan, Sibiu County, Romania, Europe
Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Calahorra tower (Torre de la Calahorra), a fortified gate of Islamic origin in the historic centre of Cordoba,UNESCO World Heritage Site, Andalusia, Spain, Europe
View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at sunset, London, England, United Kingdom, Europe
Outer Wall, Prejmer Fortified Church, dated 1212, UNESCO World Heritage Site, Prejmer, Brasov County, Romania, Europe
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe
Illuminated Prague Castle and St. Vitus Cathedral at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe
St. Mawes Castle, an artillery fortress built by Henry VIII, Cornwall, England, United Kingdom, Europe
Castillo de la Real Fuerza, La Habana Vieja, UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America
View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe
View of the Tower of London, UNESCO World Heritage Site, and Tower Bridge from Cheval Three Quays at dusk, London, England, 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
St. Catherine tower, city outer walls, fortified tower dating from the 13th century, Dinan, Brittany, France, Europe
La Cite, historic fortified city, from elevated viewpoint, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe
Gateway entrance of the Medina shopping and restaurant complex, Yasmine Hammamet, Cap Bon, Tunisia, North Africa, Africa
View of the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at sunset, London, England, United Kingdom, Europe
View of the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at dusk, London, England, United Kingdom, Europe
The Castle of Estremoz and in the foreground, Statue of St. Elizabeth (Isabella) of Portugal, Estremoz, Alentejo, Portugal, Europe
Chateau Comtal keep, La Cite, historic fortified city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe
Elevated view from Kamerlengo Fortress over the old town of Trogir at dusk, UNESCO World Heritage Site, Croatia, 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
Wawel Castle, UNESCO World Heritage Site, reflected in the Vistula River, at night, Krakow, Poland, Europe
Landgrave castle clock tower, University Museum of Cultural History, Marburg, Hesse, Germany, Europe
Wawel Castle, UNESCO World Heritage Site, reflected in Vistula River, at night, Krakow, Poland, Europe
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Chateau Comtal keep, La Cite, historic fortified city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe
Prejmer Fortified Church, dated 1212, UNESCO World Heritage Site, Prejmer, Brasov County, Romania, Europe
Ramparts dating from the 13th and 14th centuries of the medieval town of Provins, UNESCO World Heritage Site, Seine-et-Marne, Ile-de-France, France, Europe
The ancient fortified city of Carcassone, UNESCO World Heritage Site, Languedoc-Roussillon, France, 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