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The original Mutianyu section of the Great Wall, UNESCO World Heritage Site, Beijing, China, Asia
The original Mutianyu section of the Great Wall, UNESCO World Heritage Site, Beijing, China, Asia
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
Aerial image of Piel Castle (Fouldry Castle) (Fouldrey Castle), a concentric medieval fortification with a keep and three towers, Piel Island, Furness Peninsula, Barrow in Furness, Cumbria, England, United Kingdom, Europe
The Walls of Dom Fernando (Fernandine Walls) above the Douro River, Porto, Norte, Portugal, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
The Barbican, UNESCO World Heritage Site, Warsaw, Poland, Europe
Mutianyu, Great Wall of China, UNESCO World Heritage Site, Mutianyu, China, Asia
Great Wall of China, UNESCO World Heritage Site, Mutianyu, China, Asia
Desert citadel, Rayen, Iran, Western Asia
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Alcazaba, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain
Avignon Tower, UNESCO, Rhone River, Avignon, Vaucluse, Provence-Alpes-Cote d'Azur, France
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, UNESCO, Foggia, Apulia, Italy
Castelo de Silves, Silves, Algrave, Portugal
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
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
The harbour and Fort da Ponta da Bandeira in the Old Town of Lagos, Algarve, Portugal
Norman-Swabian Castle, Bari, Apulia, Italy
Norman-Swabian Castle, Bari, Apulia, Italy
Palace of the Dukes of Braganza, Guimaraes, UNESCO, Minho Region, Portugal
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
Bari, Apulia, Italy
Mirador de San Nicolas, Islamic and Mudejar architecture, Alhambra, UNESCO, Granada, Andalusia, Spain
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Monte Sant'Angelo, Foggia, Apulia, Italy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, Foggia, Apulia, Italy
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Viana do Castelo, Minho-Lima, Portugal
Falconara castle, Licata, Agrigento district, Sicily, Italy
Guimaraes Castle, Guimaraes, UNESCO, Minho Region, Portugal
Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Castle of Charles V, Monopoli, Bari, Apulia, Italy
Garagnone Fortress, Garagnone Castle, Spinazzola, Barletta-Andria-Trani, Murgia, Apulia, Italy
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
Town Hall and Fort, Trani, Barletta-Andria-Trani, Apulia, Italy
Coastal scenery and historic walls of the fort, Galle, UNESCO World Heritage Site, Sri Lanka, Asia
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
La Calahorra, Granada, Andalusia, Spain
Tower of David museum, the main courtyard, jerusalem Old City, Israel, Middle East
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Melpignano, Lecce, Salento, Apulia, Italy
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Historic walled defences to Moorish citadel fortress palace of the Alcazaba, Malaga, Andalusia, Spain, Europe
Medina defensive walls, city of Taroudant, Sous Valley, Morocco, North Africa, Africa
Calahorra Tower and the Roman bridge (Puente Romano) over the Rio Guadalquivir, UNESCO World Heritage Site, Cordoba, Andalucia, Spain, Europe
Historic castle in Alter do Chao, built in the 14th century, Alentejo, Portugal, Europe
Walled town Medina from the coast, Essaouira, Morocco, North Africa, Africa
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, 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
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Defensive walls and ramparts with view over surrounding countryside from the Castle of Terena, a listed national monument, Terena, Alentejo Central, Portugal, Europe
Inca fortification of Sacsayhuaman with Cuzco in background, near Cuzco, Peru, South America
Medieval stone tower atop a lush green hill against a vibrant blue sky with fluffy clouds, symbolizing historical fortification and ancient architecture in York, North Yorkshire, England.
Cannons on ramparts of citadel castle 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
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Castle of Xativa (Jativa), Valencia province, Spain, Europe
The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa
Holly Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe
Historic defensive buildings, Rampart Mogador, Essaouira, Morocco, North Africa, Africa
Calahorra Tower and the Roman bridge (Puente Romano) over the Rio Guadalquivir, UNESCO World Heritage Site, Cordoba, Andalucia, Spain, Europe
Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Majestic ancient castle on a hill with clear blue sky, showcasing historical architecture and heritage, 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
Battlements, stone ramparts and watch tower in historic castle ruins at Arraiolos (Pavao dos Alcaides), built in the 14th century, Alentejo, Portugal, Europe
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
Historic waterfront buildings on Grand Harbour waterside, Valletta, 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 castle of Monolithos, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe