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Gateway entrance of the Medina shopping and restaurant complex, Yasmine Hammamet, Cap Bon, Tunisia, North Africa, Africa

Wawel Castle, UNESCO World Heritage Site, reflected in Vistula River, at night, Krakow, Poland, Europe

Castillo de la Real Fuerza, La Habana Vieja, UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

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

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

St. Catherine tower, city outer walls, fortified tower dating from the 13th century, Dinan, Brittany, France, Europe

View of Tower Bridge and the Tower of London, UNESCO World Heritage Site, from Cheval Three Quays at dusk, London, England, United Kingdom, Europe

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, 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

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

Illuminated Prague Castle and St. Vitus Cathedral at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, 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

Chateau Comtal keep, La Cite, historic fortified city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

View of Hohensalzburg Castle and footbridge over Salzach River, UNESCO World Heritage Site, Salzburg, Austria, Europe

Elevated view from Kamerlengo Fortress over the old town of Trogir at dusk, UNESCO World Heritage Site, Croatia, 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

The ancient fortified city of Carcassone, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

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

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

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

Medieval city of Carcassonne, UNESCO World Heritage Site, Aude, Languedoc-Roussillon, France, 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