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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
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
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
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 Rybury Camp, an Iron Age hill fort with Neolithic causewayed enclosure, Wiltshire, 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 Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe
Aerial view of the Westbury White Horse and the Iron Age Bratton Camp Hill Fort, Wiltshire, England, United Kingdom, Europe
Aerial image of the Uffington White Horse with Uffington Castle hill fort, Berkshire Downs, Vale of White Horse, Oxfordshire, England, United Kingdom, Europe
Aerial image of Battlesbury Camp, an Iron Age Hill fort, Warminster, Wiltshire, 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 Westbury chalk quarry, with Westbury White Horse and Bratton Camp Hill Fort in background, Wiltshire, England, United Kingdom, Europe
The Jacobite steam train on the Glenfinnan Viadust on the Fort William to Mallaig Railway, Highlands, Scotland, United Kingdom, Europe
Iron-age British Camp hill fort and the Malvern Hills in autumn, Great Malvern, Worcestershire, England, United Kingdom, Europe
Sunlit Venetian Bourtzi Fortress, island, Nafplio (Nafplion), near Argos, Argolic Gulf, eastern Peloponnese, Greece, Europe
Dramatic sunset at Mow Cop Castle, border of Staffordshire and Cheshire, England, United Kingdom, Europe
Aerial image of Oldbury Camp Hill Fort with Cherhill White Horse, Cherhill Down, Calne, Wiltshire, England, United Kingdom, Europe
Porte d'Aude, entrance to walled and turreted fortress of Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
Panoramic view over Vltava River, Charles Bridge, the Mala Strana District and Prague Castle, UNESCO World Heritage Site, Prague, Bohemia, Czech Republic, Europe
Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe
Bayard's Cove Fort and the River Dart estuary in spring sunshine, Dartmouth, South Devon, England, United Kingdom, Europe
Roundhouse building, San Cibrao de Las hill fort, Castro Culture archaeological site, San Amaro, Ourense, Galicia, Spain, Europe
Aerial image of Mount Caburn with the remains of an Iron Age hill fort, east of Lewes, East Sussex, England, United Kingdom, Europe
Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe
View of Alhambra Palace complex from Generallife, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe
View of city and port from the sea Ria de Vigo estuary, Pereira Productos del Mar fishing port facility, city of Vigo, Galicia, Spain, Europe
Castle of Castillo de San Felipe, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe
View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia
Dubrovnik and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fortress), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe
Doonagore Castle between the village of Doolin and the Cliffs of Moher on the County Clare coast, County Clare, Munster, Republic of Ireland, 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
View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia
Dubrovnik Old Town and the City Walls at sunrise, from Fort Lovrijenac (St. Lawrence Fort), Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe
Hermitage Castle, Liddesdale, Hawick, Roxburghshire, Scottish Borders, Scotland, United Kingdom, Europe
Walled and turreted fortress of Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, 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
Wawel Hill Castle and Cathedral, Vistula River with swans, UNESCO World Heritage Site, Krakow, Poland, Europe
Hermitage Castle, Liddesdale, Hawick, Roxburghshire, Scottish Borders, Scotland, United Kingdom, Europe