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View along the restored section of the Great Wall, UNESCO World Heritage Site, Mutianyu, near Beijing, China, Asia
Fort Soledad looking over Umatac Bay, Guam, US Territory, Central Pacific, Pacific
St. James Fort at sunset, Funchal, Madeira, Portugal, Atlantic, Europe
Lindisfarne Castle on Holy Island, Northumberland, England, United Kingdom, Europe
Lindisfarne Castle on Holy Island, Northumberland, England, United Kingdom, Europe
Aerial image of Bury Hill Fort, Wiltshire, England, United Kingdom, Europe
San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America
Elephants taking tourists to the Amber Fort near Jaipur, Rajasthan, India, Asia
Hermitage Castle, Liddesdale, Hawick, Roxburghshire, Scottish Borders, Scotland, United Kingdom, Europe
Walled and turreted fortress of Cite, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe
Castle Gutenfels above Kaub in the Rhine valley, Rhineland-Palatinate, Germany, Europe
Peel Castle, Peel, Isle of Man, Europe
Mow Cop folly ruins at Mow Cop, Cheshire, England, United Kingdom, Europe
View from the Campanone, Pontremoli, Massa-Carrara, Tuscany, Italy, Europe
Fort Shirley, Cabrits National Park, Portsmouth, Dominica, West Indies, Caribbean, Central America
Larissa Fort, Argos, Peloponnese, Greece, Europe
The fort of Fenestrelle, Piedmont, Italy, Europe
Dun Aonghasa, Inish More, Aran Islands, Republic of Ireland, Europe
Fort St. George, St. George's, Grenada, Windward Islands, Lesser Antilles, West Indies, Caribbean, Centrla America
The Castle of La Muela, Consuegra, Toledo, Castilla-La Mancha, Spain, Europe
Tsarevets fortress, Veliko Tarnovo, Bulgaria, Europe
View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia
The massive 15th century fort of Kumbhalgarh in the Aravalli hills, Rajasthan, India, Asia
The famous Bran Castle seen from a lookout during autumn, Bran, Romania, Europe
Garden, Amber Fort Palace with Jaigarh Fort or Victory Fort above, Jaipur, Rajasthan, India, Asia
Navan Fort, County Armagh, Ulster, Northern Ireland, United Kingdom, Europe
Pontremoli, Massa-Carrara, Tuscany, Italy, Europe
Tsarevets fortress, Veliko Tarnovo, Bulgaria, Europe
Hvar Fortress, Hvar, Croatia, Europe
Rocca Maggiore, Assisi, UNESCO World Heritage Site, Perugia, Umbria, Italy, Europe
19th century Arab fort, Kilwa Kisiwani Island, UNESCO World Heritage Site, Tanzania, East Africa, Africa
The castle, Pontremoli, Massa-Carrara, Tuscany, Italy, Europe
Rocca Albornoziana, Spoleto, Perugia, Umbria, Italy, Europe
Fort Soledad looking over Umatac Bay, Guam, US Territory, Central Pacific, Pacific
View of Saint-Pierre showing Mount Pelee in background, Fort-de-France, Martinique, Lesser Antilles, West Indies, Caribbean, Central America
Rocca Albornoziana, Spoleto, Umbria, Italy, Europe
Rocca Albornoziana, Spoleto, Umbria, Italy, Europe
The Castle of La Muela, Consuegra, Toledo, Castilla-La Mancha, Spain, Europe
Coucy le Chateau, Picardy, France, Europe
Walls of Ston, Ston, Dalmatia, Croatia, Europe
Arg-e Bam, Bam, Iran, Middle East
Qalaat Ibn Maan, 17th century Arab Castle overlooking the Graeco-Roman city, Palmyra, Syria, Middle East
Attock Fort and River Indus, Pakistan, Asia
People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
Jinshanling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia
Harbour and fortress, Cabrera Island, Cabrera National Park, Balearic Islands, Spain, Mediterranean, Europe
View by drone of sunrise over Carreg Cennen Castle in winter, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Aerial vista by drone of Carreg Cennen Castle, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Misty autumn morning above Cadbury Castle Iron Age Hillfort, Cadbury, Devon, England, United Kingdom, Europe
Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe
Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe
Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe
The 13th century Dunure Castle, built by Clan Kennedy, Carrick Coast, Ayrshire, Scotland, United Kingdom, Europe
The 13th century Dunure Castle, built by Clan Kennedy, Carrick Coast, Ayrshire, Scotland, United Kingdom, Europe
The 13th century Dunure Castle, built by Clan Kennedy, Carrick Coast, Ayrshire, Scotland, United Kingdom, Europe
Amer Fort (Amber Fort), Rajasthan, India
Amer Fort (Amber Fort), Rajasthan, India
Mehrangarh Fort, Jodhpur, Rajasthan, India
Carl Wark Hill Fort and Hathersage Moor from Higger Tor, sunrise in autumn, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Higger Tor, autumn sunrise, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe
View of Golden Gate Bridge and Fort Point from Marine Drive, San Francisco, California, United States of America, North America
Cityscape with Mehrangarh Fort in Jodhpur, India, Asia
Jaisalmer Fort, Jaisalmer, Rajasthan, India, Asia
St. Michael's Fortress and Sibenik Harbour, Sibenik, Dalmatian Coast, Croatia, Europe
Cadbury Castle Iron Age Hillfort at dawn in spring, Cadbury, Devon, England, United Kingdom, Europe
Iconic view from top of Elba mountain of Volterraio Castle on rock at 394 m, Fortress of Volterraio, symbol of Elba Island, dominates Portoferraio Gulf, Tuscan Archipelago, Tuscany, Italy, Europe
Bamburgh Castle and its beach, at Bamburgh, near Seahouses, Northumberland, England, United Kingdom, Europe
Castell y Bere, a Welsh castle constructed by Llywelyn the Great in the 1220s, Gwynedd, Wales, United Kingdom, Europe
View of the Ross Fountain and Edinburgh Castle, West Princes Street Gardens, Edinburgh, Lothian, Scotland, United Kingdom, Europe
Eberstein Castle, Gernsbach, Murgtal Valley, Black Forest, Baden Wurttemberg, Germany, Europe
View of Edinburgh Castle, Balmoral Hotel and Dugald Stewart monument from Calton Hill at golden hour, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, Europe
Elevated view of Conwy Castle, UNESCO World Heritage Site, and Conwy River visible in background, Conwy, Gwynedd, North Wales, United Kingdom, Europe
Schloss Werenwag, Hausen an der Donau, Upper Danube Nature Park, Danube Valley, Swabian Alps, Baden-Wurttemberg, Germany, Europe
The 18th century Palamidi Fortress citadel with bastion on the hill, Nafplion, Peloponnese, Greece, Europe
View of South Bay looking towards harbour and Scarborough Castle, Scarborough, Yorkshire, England, United Kingdom, Europe
The Jacobite steam train travelling to Mallaig from Fort William, on the Glenfinnan Viaduct, Highlands, Scotland, United Kingdom, Europe
Sunset over Castle Stalker and Loch Linnhe, Argyll, Scotland, United Kingdom, Europe
Bamburgh Castle, a medieval fortress, Grade I Listed Building constructed on top of a craggy outcrop of volcanic dolerite, overlooking a cricket ground, Bamburgh, Northumberland, England, United Kingdom, Europe
Bamburgh Castle, a medieval fortress, Grade I Listed Building constructed on top of a craggy outcrop of volcanic dolerite, overlooking a cricket ground, Bamburgh, Northumberland, England, United Kingdom, Europe
Bamburgh Castle, a hilltop fortress and Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe
Cliffs viewed from Dun Aengus, prehistoric hill fort, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland
Serralunga d'Alba and its castle with vineyards at sunrise in backlight in autumn, Cuneo, Langhe and Roero, Piedmont, Italy, Europe
Taking photo of cliffs from Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland
Cliffs viewed from Dun Aengus, prehistoric hill fort, Inishmore, largest of the Aran Islands, Galway Bay, County Galway, Connacht, Republic of Ireland
Higger Tor, sunrise in autumn, Hathersage Moor, from Carl Wark Hill Fort, Peak District National Park, Derbyshire, England, United Kingdom, Europe
Van Castle at sunset, Van, Anatolia, Turkey, Asia Minor, Asia
Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America
Prizren, Kosovo, Europe
Defensive stone walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland
Meadow between walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland
View of Castle, Balmoral Hotel and Princes Street from Calton Hill, Edinburgh, Scotland, United Kingdom, Europe
Harbour and Fortezze Medicee, Portoferraio, Elba, Tuscan Islands, Italy, Europe
Visitors at Castell y Bere, a Welsh castle constructed by Llywelyn the Great in the 1220s, Gwynedd, Wales, United Kingdom, Europe
Bamburgh Castle, a fortress constructed on top of a craggy outcrop of volcanic dolerite in the Middle Ages, now a Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe
Bamburgh Castle, a hilltop fortress constructed on top of a craggy outcrop of volcanic dolerite, Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe
The Castle of Grinzane Cavour with Monviso Mountain in the background, UNESCO World Heritage Site, Langhe, Piedmont, Italy, Europe
Beautiful view of the Grinzane Cavour Castle and vineyards, on an autumn day, UNESCO World Heritage Site, Cuneo province, Piedmont, Italy, Europe
Carl Walk Iron Age Hill Fort in autumn, Hathersage Moor, Peak District National Park, Derbyshire, England, United Kingdom, Europe