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

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

Evening light on the medieval city of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

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

The main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background at first sunlight, Hvar, Croatia, Europe

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

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

Entrance gate with the old fortress of Corfu Town (Kerkyra) in the background at sunset, Corfu, Greek Islands, Greece, Europe

Man standing outside the Djenne Mosque, the largest mud structure in the world, UNESCO World Heritage Site, Djenne, Niger Inland Delta, Mali, West Africa, Africa

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

The Fat Tower (Frauenturm) (Dicke Turm), part of the medieval city defences in Goerlitz, Saxony, Germany, Europe

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

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

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

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

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

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

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

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

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