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First light on fortified mud houses in the kasbah, Ait Benhaddou, UNESCO World Heritage Site, Ouarzazate, Morocco, North Africa, Africa

Torre (Tower) di Ligny, built 1671 as fort, now a Prehistory Museum, on seafront of this northwest fishing port, Trapani, Sicily, Italy, Mediterranean, Europe

The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, 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

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe

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

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

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

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

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, 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 Alhambra Palace complex from Generallife, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

View to Our Lady before Tyn Church, the Old Town Hall Clock Tower and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View to Our Lady before Tyn Church and Prague Castle at dusk, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

Bamburgh Castle and Bamburgh Castle walls from Bamburgh Village, Northumberland, England, United Kingdom, Europe

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

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

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

Illuminated Prague Castle and St. Vitus Cathedral seen from the banks of Vltava River, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

View from Krizovnicke Square to the Mala Strana District and Prague Castle, Prague, Bohemia, Czech Republic, Europe

Tourist tram passing a bridge over Vltava River with view to Prague Castle in the background, Prague, Bohemia, Czech Republic, Europe

Defensive tower and mountain landscape, Macari, San Vito lo Capo, Sicily, Italy, Mediterranean, Europe

Matriz church in walls of historic ruined castle at Mourao , Alentejo Central, Evora district, Portugal, Europe

Outer Wall, Prejmer Fortified Church, dated 1212, UNESCO World Heritage Site, Prejmer, Brasov County, Romania, Europe

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

Peter and Paul Fortress on Neva riverside, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Riga Cathedral, St. Peter's Church, St. Saviour's Anglican Church and Riga Castle in Old Town at dusk, UNESCO World Heritage Site, Riga, Latvia, Europe

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

City walls and fortified watch tower built during the first reign of Hongwu, the first emperor of the Ming dynasty, Xian City Shaanxi Province, China, Asia

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

Biertan Fortified Church, 15th century, UNESCO World Heritage Site, Biertan, Sibiu County, Romania, Europe

St. Mawes Castle, an artillery fortress built by Henry VIII, Cornwall, England, United Kingdom, Europe

La Cite, historic fortified city, from elevated viewpoint, Carcassonne, 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

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