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Moti Masjid (1646-53), Pearl Mosque built by Shah Jehan (Jahan) in the Red Fort, Agra, Uttar Pradesh, India

Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East

Porte d'Aude, entrance to walled and turreted fortress of Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

Hardknott Roman Fort interior looking west along the Eskdale Valley to the Solway Firth, South Lakes, Lake District National Park, Cumbria, England, United Kingdom, Europe

Fort Saint John, MUCEM (Museum of European and Mediterranean Civilizations), Marseille, Bouches du Rhone, Provence Alpes Cote d'Azur, France, Mediterranean, Europe

Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

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

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe

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

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia

Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe

Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe

View from Lovrijenac Fortress to the city walls of Dubrovnik at sunrise, UNESCO World Heritage Site, Croatia, Europe

Statue of Count Schulenburg with the old fortress of Corfu Town (Kerkyra) in the background at sunset, Corfu, Greek Islands, Greece, Europe

The fortress at the western end of the Great Wall, UNESCO World Heritage Site, Jiayuguan, Gansu Province, China, Asia

The fortress at the western end of the Great Wall, UNESCO World Heritage Site, Jiayuguan, Gansu Province, China, Asia

The fortress at the western end of the Great Wall, UNESCO World Heritage Site, Jiayuguan, Gansu Province, China, Asia

The fortress at the western end of the Great Wall, UNESCO World Heritage Site, Jiayuguan, Gansu Province, China, Asia

Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe

Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

The Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

Cityscape view over city centre high density buildings with cathedral church in centre, Malaga, Andalusia, Spain, Europe

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

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

Defensive walls ramparts at entrance to Berat Castle UNESCO World Heritage Site, Berat, Albania, Europe

Majestic medieval castle with stone bridge over a river, surrounded by wild nature under a cloudy sky, Eilean Donan, Dornie, Scotland, United Kingdom, Europe

Garden outside Lower Town Wall with Oleviste Church in background, Tallinn, Estonia, Baltic States, Europe

Tourist admiring the view from Kamerlengo Fortress over Trogir waterfront, Trogir, UNESCO World Heritage Site, Dalmatian Coast, Adriatic, Croatia, Europe

Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe

Looking north from Milecastle 37 to Broomlee Lough, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe

Night shot of the main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background, Hvar, Croatia, Europe

Tourists in the courtyard surrounded by defensive wall of fortress, Alcazar de los Reyes Cristianos, Cordoba, UNESCO World Heritage Site, Andalusia, Spain, Europe

Women in traditional dress walking alongside the walls of the Kasbah Cherada in Fez Medina, UNESCO World Heritage Site, Morocco, North Africa, Africa

Ladies gallery, historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe

Royal Bathing Pool at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia