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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

Buildings of rock palace fortress on rock summit, Sigiriya, UNESCO World Heritage Site, Central Province, Sri Lanka, Asia

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

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

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 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

Fortress medina and Borj Dar El Baroud Tower at Port of Tangier, Tangier, Morocco, North Africa, Africa

Giant statue of Mubarek Ahmed Sharafaddin in front of the citadel of Erbil (Hawler), capital of Iraq Kurdistan, Iraq, Middle East

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in evening light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

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

Blue wooden finish boats and nets, Sqala du Port d'Essaouira, Essaouira, Morocco, North Africa, Africa

Gateway, Fort Frederick, 1675, with Dieu et Mon Droit on coat of arms over arch, Trincomalee, Eastern province, Sri Lanka, Asia

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Tourists walk on fort ramparts in historic town of Galle, UNESCO World Heritage Site, Sri Lanka, Asia

Castell de Bellver, a 14th century castle, Palma de Mallorca, Mallorca (Majorca), Balearic Islands, Spain, Mediterranean, 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

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

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

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

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Empty road leading through stone gateways under a cloudy sky, North Yorkshire, England, United Kingdom, Europe

Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Holly Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Extensive remains of the bath site which included changing rooms, hot rooms and cold plunge pools, on the edge of what is now the River North Tyne, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Amboise Gate, Grand Master's Palace, City of Rhodes, UNESCO World Heritage Site, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe

Aerial image of Housesteads Roman Fort of Vercovicium, an auxiliary fort on Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America

Sunrise on Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

Covered cenote well at convent of San Bernardino of Sienna, Valladolid, Yucatan, Mexico, North America

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

Large wrought stones recovered from the site of the Roman Bridge that spanned the River North Tyne dating from AD 13, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe