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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

Shiva Hindu temple and Ahylia Fort Complex on banks of the Narmada River, Maheshwar, Madhya Pradesh, India

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

Hever Castle, 13th century double moated castle, and childhood home of Anne Boleyn, Kent, England, United Kingdom, 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

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

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

Looking west from Kings Hill to Housesteads Roman Fort and crag, Cuddy and Hotbank Crags, Hadrians Wall, UNESCO World Heritage Site, Northumberland (Northumbria), England, United Kingdom, Europe

Nakhl fort, dating from the 16th and 17th centuries, Batinah region, western Hajar, Oman, Middle East

San Carlos de Borromeo Castle, Pampatar City, Isla Margarita, Nueva Esparta State, Venezuela, South America

San Carlos de Borromeo Castle, Pampatar City, Isla Margarita, Nueva Esparta State, Venezuela, South America

Cannon around the ruined buildings at Fort Saint James, St. John's, Antigua, Antigua and Barbuda, Leeward Islands, West Indies, Caribbean, Central America

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

Elevated view from Kamerlengo Fortress over the old town of Trogir at sunset, UNESCO World Heritage Site, Croatia, 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

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

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

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

The Couesnon River leading to the island of Mont Saint-Michel, UNESCO World Heritage Site, Normandy, France, Europe

Fort Beekenburg, Caracas Bay, Curacao, Netherlands Antilles, West Indies, Caribbean, Central America

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

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

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

Tlingit Totem Pole, Raven's Fort Tribal House, Fort William Seward, Haines, Alaska, United States of America, North America