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

Walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Aerial image of Deal Castle, a Device fort (Henrician Castle) built by Hentry VIII, Deal, Kent, England, United Kingdom, Europe

Aerial image of Longford Castle in snow, south of Salisbury, Wiltshire, England, United Kingdom, Europe

Tourists at Masada fortress ruins, air thick with desert sand, UNESCO World Heritage Site, Israel, Middle East

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Kamerlengo Fortress (Gradina Kamerlengo) at sunrise, Trogir, UNESCO World Heritage Site, Dalmatian Coast, Adriatic, Croatia, Europe

The Alhambra, Moorish Fortress Palace, UNESCO World Heritage Site, Granada, Andalusia, Spain, Europe

Cannons, royal insignia, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Eilean Donan Castle floodlit against deep blue twilight sky and water of Loch Duich, near Dornie, Kyle, Highlands, Scotland, United Kingdom, Europe

Saranda Kolones, Kato Paphos Archaeological Park, UNESCO World Heritage Site, Paphos, Cyprus, Eastern Mediterranean, Europe

19th century Arab fort, Kilwa Kisiwani Island, UNESCO World Heritage Site, Tanzania, East Africa, Africa

Walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

Marienberg Fortress (Festung Marienberg) and River Main, Wurzburg, Romantic Road (Romantische Strasse), Bavaria, Germany, Europe

Monastery of St. John at Chora, UNESCO World Heritage Site, Patmos, Dodecanese, Greek Islands, Greece, Europe

Mirador de Daraxa o Lindaraja, Palacio de los Leones, The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

Contemporary art museum in castle Sao Jose, Arrecife, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Thomas Telford's Conwy Suspension Bridge and Conwy Castle, UNESCO World Heritage Site, at night, Conwy, North Wales, United Kingdom, Europe

Aerial image of the Tower of London, UNESCO World Heritage Site, London, England, United Kingdom, Europe

El Morro Fortress (Castillo de los Tres Reyes Magos del Morro) built in 1589, a picturesque fortress guarding the entrance to Havana Bay, Havana, Cuba, West Indies, Central America

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Fortress and Palace of the Grand Masters, UNESCO World Heritage Site, Rhodes City, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Elevated view of Old Fortress and Maitland Rotunda, Corfu Old Town, Corfu, The Ionian Islands, Greek Islands, Greece, Europe