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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
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
Hall of Public Audience (Diwan-e-Khas), City Palace, Jaipur, Rajasthan, India, Asia
Pavilion above the Ganesh Bol Gate, Amber Fort Palace, Jaipur, Rajasthan, India, Asia
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
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
Castel del Monte, octagonal castle, built for Emperor Frederick II in the 1240s, UNESCO World Heritage Site, Apulia, Italy, Europe
Cardiff Castle, Bute Park, Cardiff, Wales, United Kingdom, Europe
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
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
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
Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
Scuol Tarasp (Tarasp Castle) (Schloss Tarasp), Engadine, Graubunden, Switzerland, Europe
Top view of the spiral stairs inside the towers of masonic Initiation Well at Quinta da Regaleira, Sintra, Portugal, Europe
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
Pennard Castle, overlooking Three Cliffs Bay, Gower, Wales, United Kingdom, Europe
Al Murabbaa Heritage Fort, Al Ain, Abu Dhabi, United Arab Emirates, Middle East
Chateau de Peyrepertuse, a Cathar castle, Languedoc, France, Europe
St. Andrews Castle at dawn, Fife, Scotland, 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
Bamburgh Castle and beach, Northumberland, England, United Kingdom, Europe
Gothic St. Vitus Cathedral, Prague Castle, Hradcany, Vitava River, Prague, Bohemia, Czech Republic, Europe
Great Wall of China, UNESCO World Heritage Site, Mutianyu, China, Asia
St. Mawes Castle and coastline, St. Mawes, Cornwall, England, United Kingdom, Europe
Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe
Inner courtyard of the Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
Castle and Basilica, Esztergom, Danube bend, Hungary, Europe
Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe
Stone archway in Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
The Maharaja's sitting room in Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
Dunster Castle and Conygar Tower in Exmoor National Park, Somerset, England, United Kingdom, Europe
Chepstow Castle and the River Wye, Gwent, Wales, United Kingdom, Europe
Chepstow Castle, Gwent, Wales, United Kingdom, Europe
Evening view from Shanti Stupa to the Namgyal Tsemo fort and monastery (gompa), Leh, Ladakh, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
The 16th and 17th century fort and monastery at Basgo, Ladakh, Himalayas, India, Asia
Monnow Bridge and Gate over the River Monnow, Monmouth, Monmouthshire, Wales, United Kingdom, Europe
Neuschwanstein Castle in winter, Fussen, Bavaria, Germany, Europe
Neuschwanstein Castle in winter, Fussen, Bavaria, Germany, Europe
Rocky shores below Dunstanburgh Castle, Craster, Northumberland, England, United Kingdom, Europe
Alnwick Castle on a frosty winter morning, Alnwick, Northumberland, England, United Kingdom, Europe
Early morning sunshine in winter illuminates Alnwick Castle in Northumberland, England, United Kingdom, 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
Heart shaped rockpool reflecting the colours of a beautiful pink sunrise, Bamburgh Castle, Northumberland, England, United Kingdom, Europe
Old German fort, Swakopmund, Namibia, Africa
Henry VIII's Fort in Pendennis Castle, Falmouth, Cornwall, England, United Kingdom, Europe
The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa
Iron-age British Camp hill fort and the Malvern Hills in autumn, Great Malvern, Worcestershire, England, United Kingdom, Europe
The ancient mud brick buildings of Kasbah Ait Benhaddou bathed in golden morning light, UNESCO World Heritage Site, near Ouarzazate, Morocco, North Africa, Africa
Aerial view of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe (Drone)
Fort St. Ivana, Dubrovnik, Croatia, Europe
Burg Kreuzenstein castle, Leobendorf, Weinviertel Region, Lower Austria, near Vienna, Austria, Europe
The fortress of Massangano, Cuanza Norte, Angola, Africa
The fortress of Massangano, Cuanza Norte, Angola, Africa
Sizergh Castle Courtyard, near Kendal, Cumbria, England, United Kingdom, Europe
Golden sunrise over the village and castle at Corfe, Dorset, England, United Kingdom, Europe
Edinburgh Castle, historic fortress, Castle Rock, Castlehill, Edinburgh Old Town, UNESCO World Heritage Site, Midlothian, Scotland, United Kingdom, 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
Masmak fort, Riyadh, Saudi Arabia, Middle East
Masmak fort, Riyadh, Saudi Arabia, Middle East
Masmak fort, Riyadh, Saudi Arabia, Middle East