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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

Strong walls of Ichon-Qala (Itchan Kala) Fortress, UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe

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

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

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

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

Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain

Palace of the Popes, UNESCO, Avignon, Rhone Valley, Grand Avignon, Vaucluse, Provence-Alpes-Cote d'Azur, France

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