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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
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
Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America
Fort Saint John, MUCEM (Museum of European and Mediterranean Civilizations), Marseille, Bouches du Rhone, Provence Alpes Cote d'Azur, France, Mediterranean, Europe
Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe
The whitewashed city wall, including a defensive tower, in the white city (Citta Bianca), Ostuni, Apulia, Italy, Europe
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
Inca fortification of Sacsayhuaman with Cuzco in background, near Cuzco, Peru, South America
Aerial view, Windsor Castle, Windsor, Berkshire, England, United Kingdom, Europe
Statue of Mubarak Ben Ahmed Sharaf-Aldin at the main entrance to The Citadel, Erbil, Kurdistan, Iraq, Middle East
The Citadel, Erbil, Kurdistan, Iraq, Middle East
The Citadel, Erbil, Kurdistan, Iraq, Middle East
Statue of Mubarak Ben Ahmed Sharaf-Aldin at the main entrance to The Citadel, Erbil, Kurdistan, Iraq, Middle East
Royal Bathing Pool at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
Il-Kastell citadel fortress, Victoria (Rabat), Gozo Island, Malta, Mediterranean, Europe
The Arab Puerta de Almodovar and the mediaeval wall, Cordoba, Andalucia, Spain, Europe
Porta Asinara, Rome, Lazio, Italy, Europe
Evening sunlight on Bamburgh Castle, Northumberland, England, United Kingdom, Europe
Alcazar Castle, UNESCO, Segovia, Castile and Leon, Spain
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
The Barbican, UNESCO World Heritage Site, Warsaw, Poland, Europe
Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, 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
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
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
The harbour and Fort da Ponta da Bandeira in the Old Town of Lagos, Algarve, Portugal
Castle of Carlo V, Lecce, Salento, Apulia, Italy
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Swabian Castle, Trani, Barletta-Andria-Trani, Apulia, Italy
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
The inner wall of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
The Castle at sunrise, St Andrews, Fife, Scotland
Cliffords Tower, York, Yorkshire, England
Burgergarde fort and city walls, Monchsberg Hill, Salzburg, Austria, Europe
Tourists standing in the main gate of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
The palace walls of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia
Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe
Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe
The 18th century Fort Manoel, Manoel Island, Valletta, Malta, Mediterranean, Europe
City gate, Mdina, Malta, Mediterranean, Europe
Il-Kastell citadel fortress, Victoria (Rabat), Gozo Island, Malta, Mediterranean, Europe
Stone walled city and St. Paul's Cathedral, Mdina, Malta, Mediterranean, Europe
Bender fortress in Bender, Republic of Transnistria, Moldova, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Alhambra, UNESCO World Heritage Site, Granada, province of Granada, Andalucia, Spain, Europe
Alhambra, UNESCO World Heritage Site, Granada, Province of Granada, Andalusia, Spain, Europe
Kritinia castle, Rhodes, Dodecanese Islands, Greek Islands, Greece, Europe
The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe
The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, Europe
View to Lovrijenac Fortress (St. Lawrence Fortress), the city walls and Lokrum Island at sunset, Croatia, Europe
View from Lovrijenac Fortress to the city walls of the old town of Dubrovnik and Lokrum Island, Dubrovnik, Croatia, Europe
Night shot of the main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background, Hvar, Croatia, Europe
View to the Lovrijenac Fortress (St. Lawrence Fortress) on a stormy day, Croatia, Europe
The walls of the fort at Galle, UNESCO World Heritage Site, Sri Lanka, Asia
Sar Yazd fortress, Iran, Middle East
Sar Yazd fortress, Iran, Middle East
Sar Yazd fortress, Iran, Middle East
Sar Yazd fortress, Iran, Middle East
Narenj citadel, Nain city, Isfahan Province, Iran, Middle East
Narenj citadel, Nain city, Isfahan Province, Iran, Middle East
Medieval Castle, Obidos, Oeste, Leiria district, Portugal, Europe
Statue of Count Schulenburg with the old fortress of Corfu Town (Kerkyra) in the background at sunset, Corfu, Greek Islands, Greece, Europe
Xi'an City Wall, Shaanxi Province, China, Asia
Xi'an City Wall, Shaanxi Province, China, Asia
Zhenbeitai Tower of the Great Wall, Yulin, Shaanxi Province, China, Asia
Women in traditional dress walking alongside the walls of the Kasbah Cherada in Fez Medina, UNESCO World Heritage Site, Morocco, North Africa, Africa
Bamburgh Castle and Bamburgh Castle walls from Bamburgh Village, Northumberland, England, United Kingdom, Europe
Puerta de Tierra gateway entrance, Fortifications Spanish military architecture of city walls, Campeche City, UNESCO World Heritage Site, Campeche State, Mexico, North America
Puerta de Tierra gateway entrance, Fortifications, Spanish military architecture of city walls, Campeche City, UNESCO World Heritage Site, Campeche State, Mexico, North America
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Norman-Swabian Castle, Bari, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Norman-Swabian Castle, Barletta, Barletta-Andria-Trani, Apulia, Italy
Massafra Castle, Massafra, Taranto, Apulia, Italiy
Blue domed mosque minaret, Oman, Middle Easti National Flag and Al-Mirani Fort, Old Muscat, Oman, Middle East
Venus Castle, Erice, Sicily, Italy, Europe
Historic castle in Alter do Chao, built in the 14th century, Alentejo, Portugal, Europe
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe