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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 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
Viana do Castelo, Minho-Lima, Portugal
Norman-Swabian Castle, Bari, Apulia, Italy
Palace of the Dukes of Braganza, Guimaraes, UNESCO, Minho Region, Portugal
Guimaraes Castle, Guimaraes, UNESCO, Minho Region, Portugal
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
Castle of Charles V, Monopoli, Bari, 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
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Mirador de San Nicolas, 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
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Norman Swabian Aragonese Castle, Monte Sant'Angelo, 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
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Torres de Serranos, Valencia, Spain, Europe
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Sao Joao Baptista's fort, Berlenga Grande Island, Portugal, Europe
De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy
Torres de Serranos, Valencia, Spain, 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
Norman-Swabian Castle, Bari, Apulia, Italy
Falconara castle, Licata, Agrigento district, Sicily, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Tower of David museum, the main courtyard, jerusalem Old City, Israel, Middle East
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
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
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
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
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, 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
Fortress of Frederick II of Swabia, Castel del Monte, Andria, Western Murge, Barletta, Apulia, Italy, Europe
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa
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
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.
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, 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
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
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe
Historic castle in Alter do Chao, built in the 14th century, Alentejo, Portugal, Europe
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
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Tower of Mangana (Torre Mangana), on site of Moorish city, Cuenca, Castille La Mancha, Spain, Europe
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Tower of David through trees, Jerusalem Old City, Israel, Middle East
Majestic ancient castle on a hill with clear blue sky, showcasing historical architecture and heritage, Northumberland, 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
Castle of Xativa (Jativa), Valencia province, Spain, Europe
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, 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
Battlements, stone ramparts and watch tower in historic castle ruins at Arraiolos (Pavao dos Alcaides), built in the 14th century, Alentejo, Portugal, Europe
The castle of Monolithos, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe
Castle of Lykourgos Logothetis, Pythagorio, Samos, North Aegean Islands, Greek Islands, Greece, Europe
The ancient Kasbah Ait Benhaddou bathed in morning light and reflecting in river, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa
St. Mary in Castro and Roman Pharos, an ancient lighthouse, at Dover Castle, Dover, United Kingdom
Kritinia castle, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe
Castel Sant Angelo, Rome, Lazio, Italy, Europe
Castel Sant Angelo, Rome, Lazio, Italy, Europe
Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
Hovenweep Castle, Square Tower Group, Anasazi Ruins, dating from AD1230 to 1275, Hovenweep National Monument, Utah, United States of America, North America
Outer walls of the old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
Byzantine Citadel, Selcuk, Anatolia, Turkey, Asia Minor, Eurasia
View of the fortified old village and surrounding mountains, Telouet Kasbah High Atlas, Morocco, North Africa, Africa
Palm trees surrounding the historic fortified residence (kasbah) of Amridil, Skoura, Atlas mountains, Ouarzazate province, Morocco, North Africa, Africa
Walls of Avila, UNESCO, Castilla y Leon, Spain
Prague Castle, Hradcany, Mala Strana, and Charles Bridge lit by sunrise, UNESCO World Heritage Site, Prague, Czech Republic, Europe