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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

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

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

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

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

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

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

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

Old town and St. Nicholas church on top of Narikala Fortress, Tbilisi, Georgia, Caucasus, Central Asia, Asia

Selcuk Byzantine castle stands on the hill of Ayasuluk, Selcuk, Anatolia, Turkey, Asia Minor, Eurasia

Panoramic view over Vltava River, Charles Bridge, the Mala Strana District and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe

Sunlit Venetian Bourtzi Fortress, island, Nafplio (Nafplion), near Argos, Argolic Gulf, eastern Peloponnese, Greece, Europe

Rabsztyn Castle Ruins, Trail of the Eagles' Nests, Krakow-Czestochowa Upland (Polish Jura), Lesser Poland Voivodeship, Poland, Europe

Rabsztyn Castle Ruins, Trail of the Eagles' Nests, Krakow-Czestochowa Upland (Polish Jura), Lesser Poland Voivodeship, Poland, Europe

Ljubljana skyline with view of the city and Ljubljana Castle complex on Castle Hill, Ljubljana, Slovenia, Europe

Dramatic sunset at Mow Cop Castle, border of Staffordshire and Cheshire, England, United Kingdom, Europe

Ljubljana skyline with view of the city and Ljubljana Castle complex on Castle Hill, Ljubljana, Slovenia, Europe

View of Alhambra Palace complex from Generallife, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe

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

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

Cannons and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

Looking north from Milecastle 37 to Broomlee Lough, Hadrians Wall, UNESCO World Heritage Site, Northumbria National Park, Northumberland, England, United Kingdom, Europe

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Cannon points towards the sea, with St. Eustatius in the distance, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

Dubrovnik and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fortress), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Ben Lui and Kilchurn Castle across Loch Awe, Loch Awe, Argyll and Bute, Scottish Highlands, Scotland, United Kingdom, Europe

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

Kasbah Ait Ben Haddou and the Ounila River, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Cannon and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

Medieval stone tower on a hill with a clear blue sky in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Romantic Neuschwanstein Castle and German Alps in autumn, southern part of Romantic Road, Bavaria, Germany, Europe

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

Mosaic floor, Byzantine Church, hill top palace complex, Masada fortress, UNESCO World Heritage Site, Israel, Middle East

Gutenfels Castle, Pfalzgrafenstein Castle, Kaub, Rhine Valley, Rhineland-Palatinate, Germany, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Sunset over Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Wawel Hill Castle and Cathedral, Vistula River with swans, UNESCO World Heritage Site, Krakow, Poland, Europe

Majestic ancient castle on a hill with clear blue sky, showcasing historical architecture and heritage, Northumberland, England, United Kingdom, Europe

View to St. Eustatius from Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America