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San Sebastian Fort, City of Sao Tome, Sao Tome and Principe, Atlantic Ocean, Africa
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
Old watchtower Baluarte de San Diego, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Entrance to the old Fort Santiago, Intramuros, Manila, Luzon, Philippines, Southeast Asia, Asia
Fort San Pedro, Cebu City, Cebu, Philippines, Southeast Asia, Asia
Hall of Public Audience (Diwan-e-Khas), City Palace, Jaipur, Rajasthan, India, Asia
Gardens and Hall of Mirrors, Amber Fort Palace, Jaipur, Rajasthan, India, Asia
Painting of Red Fort, 19th century, Archaeological Museum, Red Fort, Delhi, India, Asia
Hall of Public Audience (Diwan-e-Khas), City Palace, Jaipur, Rajasthan, India, Asia
Gardens and Hall of Mirrors, Amber Fort Palace, Jaipur, Rajasthan, India, Asia
Pavilion above the Ganesh Bol Gate, Amber Fort Palace, Jaipur, Rajasthan, India, Asia
Hall of Public Audience (Diwan-e-Khas), Amber Fort Palace, Jaipur, Rajasthan, India, Asia
Bodiam Castle, East Sussex, 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
White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America
Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America
Mist at sunrise at McDermott's Castle on Lough Key or Castle Island in County Roscommon, Connacht, Republic of Ireland, Europe
Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe
Victor Column, Kalemegdan Fortress, Belgrade, Serbia, Europe
Trujillo, Caceres, Extremadura, Spain, 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
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Cardiff Castle, Bute Park, Cardiff, Wales, United Kingdom, Europe
Guide talking to tourists at the Inca fortification of Sacsayhuaman, near Cuzco, Peru, South America
Amberd fortress located on the slopes of Mount Aragats, with Mount Ararat in the distance, Yerevan, Aragatsotn, Armenia, Central Asia, Asia
Norman Keep, Cardiff Castle, Cardiff, Wales, United Kingdom, Europe
Norman Keep, Cardiff Castle, Cardiff, Wales, United Kingdom, Europe
Norman Keep, Cardiff Castle, Cardiff, Wales, 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
Frederiksborg Slot Castle and the Baroque garden, Hillerod, Zealand, Denmark, Scandinavia, Europe
Statue of Mubarak Ben Ahmed Sharaf-Aldin at the main entrance to The Citadel, Erbil, Kurdistan, Iraq, Middle East
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
High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe
High angle view of the old town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church at dusk, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress and Dom Cathedral at dusk, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe
High angle view of the Old Town, UNESCO World Heritage Site, with Hohensalzburg Fortress, Dom Cathedral and Kappuzinerkirche Church, Salzburg, Salzburger Land, Austria, Europe
Kotor Old Town and fortifications at sunrise, Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe
Mountain landscape, taken from the top of Sigiriya Rock Fortress (Lion Rock), Sri Lanka, Asia
Sigiriya Rock Fortress, UNESCO World Heritage Site, seen from Pidurangala Rock, Sri Lanka, Asia
Jersey Round Tower, Le Hocq, St. Clement, Jersey, Channel Islands,Europe
Dunnottar Castle outside of Stonehaven, Aberdeenshire, Scotland, United Kingdom, Europe
Fortress medina and Borj Dar El Baroud Tower at Port of Tangier, Tangier, Morocco, North Africa, Africa
Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia
The Mehrangarh Fort of Jodhpur, Rajasthan, India, Asia
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
A storm passes behind Bamburgh Castle with the last light of the day illuminating the rocky shoreline and castle, Northumberland, England, United Kingdom, Europe
Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe
Lombardia Castle, Enna, Sicily, Italy, Mediterranean, Europe
Lombardia Castle, Enna, Sicily, Italy, Mediterranean, Europe
Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia
Caerphilly Castle, Cardiff, Wales, United Kingdom, Europe
Ait-Benhaddou Kasbah, Morocco, North Africa
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
North Bastion view over Essaouira, Morocco, North Africa, Africa
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, 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
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
Fortified Ibiza Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza, Balearic Islands, Spain, Europe
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom
Chateau de Peyrepertuse, a Cathar castle, Languedoc, France, Europe
St. Andrews Castle at dawn, Fife, Scotland, United Kingdom, Europe
City of London skyscrapers viewed across the River Thames, London, England, United Kingdom, Europe
St. Rules Tower at St. Andrews Cathedral, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle, Fife, Scotland, United Kingdom, Europe
St. Andrews Castle at dawn, Fife, Scotland, United Kingdom, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Bamburgh Castle and beach, Northumberland, England, United Kingdom, Europe
The Kings Tower at Knaresborough Castle in the snow Knaresborough, Yorkshire, England, United Kingdom, Europe
Kidwelly Castle, Carmarthenshire, Wales, United Kingdom, Europe
Gothic St. Vitus Cathedral, Prague Castle, Hradcany, Vitava River, Prague, Bohemia, Czech Republic, Europe
Sao Joao Baptista's fort, Berlenga Grande Island, Portugal, Europe
Aerial view of Beaumaris Castle, UNESCO World Heritage Site, Beaumaris, Isle of Anglesey, North Wales, 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
Fort San Felipe de Lara, Rio Dulce, Guatemala, Central America
Desert citadel, Rayen, Iran, Western Asia
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, Europe
Norman-Swabian Castle, Bari, Apulia, Italy
Norman-Swabian Castle, Bari, Apulia, Italy
Caserma Bergia, Bergia Barracks, Bari waterfront, Bari, Apulia, Italy