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Pena National Palace, UNESCO World Heritage Site, Sintra, Portugal, Europe
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Framlingham Castle, a 12th century fortress, the refuge of Mary Tudor before she became Queen in 1553, Suffolk, England. Engineers: Engineers: Taken from a public place
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Architectural details of the crenellated walls,tower and buttresses inside the castle at Jaalan Bani bu Hasan
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Walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
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Great Wall of China, UNESCO World Heritage Site, and the Yellow River in the Tengger desert at Shapotou near Zhongwei, Ningxia Province, China, Asia
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The castle at Almansa, Albacete, in Castile la Mancha (Castilla La Mancha), Spain, Europe
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Cannon on the ramparts, The Citadel, Victoria (Rabat), Gozo, Malta, Europe
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The 19th century Arab fort, Kilwa Kisiwani Island, UNESCO World Heritage Site, Tanzania, East Africa, Africa
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Amar Singh's Gate, Red Fort, UNESCO World Heritage Site, Agra, Uttar Pradesh state, India, Asia
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Alcazar of Segovia, Segovia, Segovia Province, Castilla y Leon, Spain
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Cahir Castle, Cahir, County Tipperary, Ireland; 12th century castle and estate
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Oman, Dakhiliyah, Jabrin Fort. Built in around 1670 and restored in the early 1980s.
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Fortified wall passing through mountains, Great Wall Of China, China
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Kilkenny Castle, Kilkenny, County Kilkenny, Leinster, Republic of Ireland (Eire), Europe
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An Omani man insideNakhl Fort which stands in the foothills of the Western Hajar Mountains. The early foundations are thought to pre-date Islam. The mainly 17th century fortress visible today stands over 30 metres high and covers 3,400 square metres.
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Porte d'Aude, walled and turreted fortress of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
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Wray Castle, holiday home of Beatrix Potter, Windermere, Lake District National Park, Cumbria, England, United Kingdom, Europe
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Achill Island, Co Mayo, Ireland; 15th Century Carrickkildavnet Castle used by Grace O'Malley
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Exterior of the walls and castle of Belmonte in Cuenca, Castile la Mancha (Castilla la Mancha), Spain, Europe
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The blue and gold dome and minaret of Masjid Sultan Qaboos are framed by the towers of Nizwa Fort .
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Drum Castle, dating from between the 13th and 17th centuries, with a 13th century keep, near Peterculter, Aberdeenshire, Scotland, United Kingdom, Europe
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Fortifications, Ponta Delgada, Sao Miguel island, Azores, Portugal, Europe
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Bodiam castle reflected in moat, Bodiam, East Sussex, England, United Kingdom, Europe
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Caerlaverock Castle dating from the 13th century, near Dumfries, Dumfries and Galloway, Scotland, United Kingdom, Europe
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King's Bastion, Fortress of Louisbourg National Historic Site, Cape Breton Island, Nova Scotia, Canada, North America
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The walls and moat of the Fortress in the former Portuguese colony of Diu, Union Territory of Diu and Daman, India, Asia
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Sweden, Island of Gotland, Visby, The very well preserved Ring Wall and battlements of the North Wall
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Fortified wall passing through mountains, Great Wall Of China, China
Premium Royalty-Free
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Acropolis, Lindos, island of Rhodes, Dodecanese, Greek Islands, Greece, Europe
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Telford Suspension Bridge at dusk, crossing the River Conwy, leading to Conwy Castle, UNESCO World Heritage Site, Gwynedd, North Wales, United Kingdom, Europe
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St. Georges Fort, oldest fort built by Portuguese in the sub-Sahara, Elmina, Ghana, West Africa, Africa
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