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View of Jaisalmer Fort, built in 1156 by Rawal Jaisal, which has 99 bastions around its circumference, Jaisalmer, Rajasthan, India

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

Qasr al-Abd (Fortress of the Servant), 3rd century BD Hellenistic palace west of Aman in Wadi as-Sir, Iraq al-Amir, Jordan, Middle East

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

A woman in a yellow sari looking out over the 'Blue city' and fort, Jodhpur, Rajasthan State, India, Asia

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

Venetian harbour, Venetian Fortress, Iraklion (Heraklio) (Iraklio), Crete, Greek Islands, Greece, Europe

Hohensalzburg Fortress and Alt Stadt illuminated at dusk, Salzburg, Salzburger Land, Austria, Europe

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

White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

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

Fresh Spring snow at dawn highlight ripples and marks in the sand beneath Bamburgh Castle, Bamburgh, Northumberland, England

Buildings of rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

Metal staircase climbing to rock palace fortress, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

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

Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America

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

La Chaine and St. Nicholas towers at the entrance to the ancient port of La Rochelle at dusk, Charente-Maritime, France, Europe

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

Church of Surb Astvatsatsin (Vahramashen Church) at Amberd fortress located on the slopes of Mount Aragats, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia

Medieval Malbork Castle, Marienburg Fortress of Mary, UNESCO World Heritage Site, Pomerania, Poland, 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

Pikk Hermann (Tall Hermann) Tower at Toompea Castle, Toompea, Tallinn, Estonia, Baltic States, Europe

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe

Aerial image of Carisbrooke Castle, a historic motte-and-bailey castle, Carisbrooke, near Newport, Isle of Wight, England, United Kingdom, Europe

Aerial image of Windsor Castle, the largest inhabited castle in the world, Windsor, Berkshire, England, United Kingdom, Europe

Aerial image of Herstmonceux Castle, a brick-built Tudor castle near Herstmonceux, East Sussex, England, United Kingdom, Europe

Aerial image of Bamburgh Castle, a Norman castle built on a basalt outcrop on the coast, Bamburgh, Northumberland, England, United Kingdom, Europe

Aerial image of Corfe Castle, Purbeck Hills, between Wareham and Swanage, Dorset, England, United Kingdom, Europe

People enjoy an evening walk outside of the Red Fort (Lal Qila), built by Shah Jahan between 1638 and 1648, UNESCO World Heritage Site, Delhi, India, Asia

Aerial image of Maiden Castle, an Iron Age hill fort, Winterborne Monkton, near Dorchester, Dorset, England, United Kingdom, Europe