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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

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 Oldbury Camp Hill Fort with Cherhill White Horse, Cherhill Down, Calne, Wiltshire, 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 Mount Caburn with the remains of an Iron Age hill fort, east of Lewes, East Sussex, 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

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

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

Roundhouse building, San Cibrao de Las hill fort, Castro Culture archaeological site, San Amaro, Ourense, Galicia, 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

Bayard's Cove Fort and the River Dart estuary in spring sunshine, Dartmouth, South Devon, England, United Kingdom, Europe

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

Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, 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

Castle of Castillo de San Felipe, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, 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

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 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

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

The colorful castle of Palacio da Pena, UNESCO World Heritage Site, on top of hill Sao Pedro de Penaferrim, Sintra, Lisbon district, Portugal, Europe

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

The Folly at Mow Cop illuminated by amazing sunset, Mow Cop, Cheshire, England, United Kingdom, 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

View along the restored section of the Great Wall, UNESCO World Heritage Site, Mutianyu, near Beijing, China, Asia