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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
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
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
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
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
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
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
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Cliffords Tower, York, Yorkshire, England
Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe
The 18th century Fort Manoel, Manoel Island, Valletta, Malta, Mediterranean, 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
The gate of Castello Svevi, the 13th century castle built for King Frederick II, the Holy Roman Emperor, in Trani, Apulia, Italy, Europe
View to the Lovrijenac Fortress (St. Lawrence Fortress) on a stormy day, Croatia, Europe
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
Zhenbeitai Tower of the Great Wall, Yulin, Shaanxi Province, China, Asia
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
The harbour and Fort da Ponta da Bandeira in the Old Town of Lagos, Algarve, Portugal
Tourists standing in the main gate of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
Sar Yazd fortress, Iran, Middle East
Cannon in historic castle in 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
Il-Kastell citadel fortress, Victoria (Rabat), Gozo Island, Malta, Mediterranean, Europe
Defensive walls San Cibrao de Las hill fort, Castro Culture archeological site, San Amaro, Ourense, Galicia, Spain, Europe
Historic medieval Soutomaior Castle (Castelo de Soutomaior), Pontevedra, Galicia, Spain, Europe
Medina defensive walls, city of Taroudant, Sous Valley, Morocco, North Africa, Africa
Aerial view, Windsor Castle, Windsor, Berkshire, England, United Kingdom, Europe
Castle of Castillo de San Felipe, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe
Women in traditional dress walking alongside the walls of the Kasbah Cherada in Fez Medina, UNESCO World Heritage Site, Morocco, North Africa, Africa
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Rumeli Hisari (Fortress of Europe or Rumelihisari), elevated view from the Bosphorus Strait, Hisarustu, Istanbul, Turkey, Europe
Il-Kastell citadel fortress, Victoria (Rabat), Gozo Island, Malta, Mediterranean, Europe
Stone walled city and St. Paul's Cathedral, Mdina, Malta, Mediterranean, Europe
The Alhambra, UNESCO World Heritage Site, Granada, Andalucia, Spain, 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
Fort Diamant, Cayenne, French Guiana, Department of France, South America
Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Historic castle in Alter do Chao, built in the 14th century, Alentejo, Portugal, Europe
Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America
Royal Bathing Pool at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia
Historic castle, medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
City gate, Mdina, Malta, Mediterranean, Europe
Aerial of Kalmar Castle, Kalmar, Sweden, Scandinavia, Europe
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Evening sunlight on Bamburgh Castle, Northumberland, England, United Kingdom, Europe
The city wall of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia
Inca fortification of Sacsayhuaman with Cuzco in background, near Cuzco, Peru, South America
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
Blue domed mosque minaret, Oman, Middle Easti National Flag and Al-Mirani Fort, Old Muscat, Oman, Middle East
Venus Castle, Erice, Sicily, Italy, Europe
Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America
Historic walled castle in hilltop village of Monsaraz, Alto Alentejo, Portugal, Europe
Xi'an City Wall, Shaanxi Province, China, Asia
The Arab Puerta de Almodovar and the mediaeval wall, Cordoba, Andalucia, Spain, Europe
Cathedral church tower and ruins inside citadel castle walls Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe
Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Eketorp Fortress, Oland, Sweden, Scandinavia, Europe
The Citadel, Erbil, Kurdistan, Iraq, Middle East
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
The inner wall of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
City Gate near Kasbah, Marrakesh, Morocco, North Africa, Africa
The Castle at sunrise, St Andrews, Fife, Scotland
View of the River Seine from the Roche Guyon Castle, Normandy, France, Europe
Bender fortress in Bender, Republic of Transnistria, Moldova, Europe
The main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background at first sunlight, Hvar, Croatia, Europe
Kalmar Castle, Kalmar, Sweden, Scandinavia, Europe
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Fortress Fortaleza San Felipe, Puerto Plata, Dominican Republic, West Indies, Caribbean, Central America
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Heroes statues in front of the Bender fortress in Bender, Republic of Transnistria, Moldova, Europe
Low Lighthouses in Hurst Castle, Keyhaven, Hampshire, England, United Kingdom, Europe
Xi'an City Wall, Shaanxi Province, China, Asia
Alhambra, UNESCO World Heritage Site, Granada, Province of Granada, Andalusia, 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
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Blue domed mosque with minaret and Al-Mirani Fort, Old Muscat, Oman, Middle East