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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

The 16th century Belem Tower (Torre de Belem), designed by Francisco Arruda, by the Tejo River (Tagus River), Lisbon, Portugal, Europe

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

Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

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

Fort St. Angelo, fishing boat and Vittoriosa (Birgu) at sunset, Grand Harbour, Valletta, Malta, Mediterranean, 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

Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America

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

Wertheim Castle reflecting in Main River, Wertheim, Main Tauber District, Baden Wurttemberg, Germany, Europe

Wertheim Castle reflecting in Main River, Wertheim, Main Tauber District, Baden Wurttemberg, Germany, Europe

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

Castell de Bellver, a 14th century castle, Palma de Mallorca, Mallorca (Majorca), Balearic Islands, Spain, Mediterranean, Europe

Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe

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

Torre (Tower) di Ligny, built 1671 as fort, now a Prehistory Museum, on seafront of this northwest fishing port, Trapani, Sicily, Italy, 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

Colourful paper lanterns in front of a golden Buddha in the fortress of Suwon, UNESCO World Heritage Site, Suwon, South Korea, Asia

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

Bathing pool in rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

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

Castillo de la Real Fuerza (Castle of the Royal Force), La Habana Vieja, UNESCO World Heritage Site, Havana, La Habana Province, Cuba, West Indies, Caribbean, Central America

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

Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, 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

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