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Cannon and green hills, Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

San Felipe del Morro Castle, UNESCO World Heritage Site, San Juan Historic Site, Puerto Rico, Caribbean, Central America

Citadel (Tower of David), Old City Walls, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

A lookout post fortification with a view of the Adriatic Sea, on the City Wall, Dubrovnik, Croatia, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

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

Remains of buildings at Fort Union National Monument, New Mexico, United States of America, North America

Old wagon wheels with remnants of Fort Union behind, Fort Union National Monument, New Mexico, United States of America, North America

Castle Stahleck above the village of Bacharach in the Rhine valley, Rhineland-Palatinate, Germany, Europe

View at dawnfrom the Lovrijenac Fortress over the walled old town of Dubrovnik, UNESCO World Heritage Site, Croatia, Europe

The Lovrijenac Fortress (St. Lawrence Fortress) outside the old town of Dubrovnik at sunset, Croatia, Europe

Defensive city wall and moat across the narrow approach isthmus, Ceuta, the Spanish enclave on the coast of Morocco, North Africa, Africa

Ruins of King Kassapa's Palace in front of the view from of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Citadelle St. Elme (St. Elme Citadel), Villefranche sur Mer, Cote d'Azur, French Riviera, Provence, France, Europe

Statue of Allan Ramsay with Edinburgh Castle in distance, Edinburgh, Scotland, United Kingdom, Europe

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

Ses Taules Gate, Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza town, Ibiza, Balearic Islands, Spain, Europe

San Felipe del Morro, UNESCO World Heritage Site, San Juan, Puerto Rico, West Indies, Caribbean, Central America

San Felipe del Morro Castle, UNESCO World Heritage Site, San Juan Historic Site, Puerto Rico, Caribbean, Central America

Old Main Bridge over River Main and Fortress Marienberg behind, Wurzburg, Franconia, Bavaria, Germany, Europe

Ortigia Castle (Castello Maniace) (Castle Maniace), Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Kotor Old Town, marina and fortifications at dawn with view of the Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Conwy medieval castle in summer, UNESCO World Heritage Site, Gwynedd, North Wales, United Kingdom, Europe

Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress and Dom Cathedral on the River Salzach, Salzburg, Salzburger Land, Austria, Europe

Milecastle 37 looking west, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

Citadel (Tower of David), Old City Walls, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

Turquoise Mediterranean Sea and Ortigia Castle (Castello Maniace) (Castle Maniace), Syracuse (Siracusa), Sicily, Italy, Mediterranean, Europe

View of The Carenage from Fort George, St. Georges, Grenada, Windward Islands, West Indies, Caribbean, Central America

Old bridge over the River Neckar, Old Town and castle, Heidelberg, Baden-Wurttemberg, Germany, Europe

Looking down over the Aravalli hills and winding ramparts from the top of Kumbhalgarh Fort, Rajasthan, India, Asia

Citadelle St. Elme (St. Elme Citadel), Villefranche sur Mer, Cote d'Azur, French Riviera, Provence, France, Europe

The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Vagen Harbour at night with the Bryggen waterfront, UNESCO World Heritage Site, and the Bergenhus fortress, Bergen, Hordaland, Norway, Scandinavia, Europe

Towards sunset, view east along Hadrians Wall from Windshields Crag to Crag Lough and Hotbank Farm, UNESCO World Heritage Site, Northumberland National Park, Northumbria, England, United Kingdom, Europe

Castle Stahleck above the village of Bacharach in the Rhine valley, Rhineland-Palatinate, Germany, Europe

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