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Defensive stone walls of Dun Aengus, prehistoric hill fort, Inishmore, largest Aran Island, Galway Bay, County Galway, Connacht, Republic of Ireland

The 13th century Dunure Castle, built by Clan Kennedy, Carrick Coast, Ayrshire, Scotland, United Kingdom, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Medieval citadel, Carcassonne, a hilltop town in southern France, UNESCO World Heritage Site, Carcassonne, Languedoc, France, Europe

Bamburgh Castle and its beach, at Bamburgh, near Seahouses, Northumberland, England, United Kingdom, Europe

View of the Ross Fountain and Edinburgh Castle, West Princes Street Gardens, 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

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 constructed on top of a craggy outcrop of volcanic dolerite, Grade I Listed Building, Bamburgh, Northumberland, England, United Kingdom, Europe

Beautiful view of the Grinzane Cavour Castle and vineyards, on an autumn day, UNESCO World Heritage Site, Cuneo province, Piedmont, Italy, Europe

Bran Castle, Bran, near Brasov, Transylvania. The castle was built by Saxons in 1377 who were given the privilege by Louis I of Hungary. It is a national monument and landmark in Transylvania and famous for its association with the Dracula story

Bran Castle, Bran, near Brasov, Transylvania. The castle was built by Saxons in 1377 who were given the privilege by Louis I of Hungary. It is a national monument and landmark in Transylvania and famous for its association with the Dracula story.

Young woman standing on a defensive wall of Smbataberd Fortress, on the crest of a hill between the villages of Artabuynk and Yeghegis, near Yeghegnadzor, Vayots Dzor province, Armenia, Eurasia

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, 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

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

Detail of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Bosa colorful city with castle on top of the hill seen from outside of the city, Bosa, Sardinia, Italy, Mediterranean, Europe

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Castell y Bere, a Welsh castle constructed by Llywelyn the Great in the 1220s, Gwynedd, Wales, United Kingdom, Europe

The 18th century Palamidi Fortress citadel with bastion on the hill, Nafplion, Peloponnese, Greece, Europe

Bamburgh Castle, a hilltop fortress and 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

Sunrise view of the Acropolis of Athens, UNESCO World Heritage Site, a historic fortress on a rocky hill above Athens, Greece, 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

Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe

Bosa city colorful buildings with castle on top of the hill and Vecchio bridge crossing Temo river, Bosa, Sardinia, Italy, Mediterranean, Europe

Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe

Visitors at Castell y Bere, a Welsh castle constructed by Llywelyn the Great in the 1220s, Gwynedd, Wales, United Kingdom, Europe

Qalaat Ibn Maan, 17th century Arab Castle overlooking the Graeco-Roman city, Palmyra, Syria, Middle East

View of Castle, Balmoral Hotel and Princes Street from Calton Hill, Edinburgh, Scotland, United Kingdom, Europe

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Brimstone Hill Fortress, 18th century compound, 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

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

The 13th century Dunure Castle, built by Clan Kennedy, Carrick Coast, Ayrshire, Scotland, United Kingdom, Europe

Paddle boarder under Cromwell's Castle, a castle built during the English Civil War on the west coast of Tresco, Isles of Scilly, England, United Kingdom, Europe

View of Edinburgh Castle from Princes Street at sunset, UNESCO World Heritage Site, Edinburgh, Scotland, 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 a bastion on the hill, Nafplion, Peloponnese, Greece, Europe

Ancient Arab fortress of The Alhambra, UNESCO World Heritage Site, Granada, Andalusia, Spain, Europe

Ali Pasha Tepelena Fortress overlooking the small port at Porto Palermo, Ionian Coast, Albania, Europe

View of Edinburgh Castle, Balmoral Hotel and Princes Street from Calton Hill at golden hour, Edinburgh, Lothian, Scotland, United Kingdom, 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

View of South Bay looking towards harbour and Scarborough Castle, Scarborough, Yorkshire, England, United Kingdom, Europe

Xativa castle at dusk, at a height of 310 metres above the modern-day city, Xativa, Valencia, Spain, Europe

Pennard Castle and Three Cliffs Bay, Gower Peninsula, Swansea, West Glamorgan, Wales, United Kingdom, Europe

Panoramic view of Portoferraio Gulf, Elba Island, from top of Monte Volterraio on which the fortress dominates north part of island, with Church of San Leonardo in the background, Tuscan Archipelago, Tuscany, Italy, Europe

View of Edinburgh Castle, Balmoral Hotel and Princes Street from Calton Hill at dusk, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, Europe

View of Edinburgh Castle, Balmoral Hotel and Dugald Stewart monument from Calton Hill at dusk, UNESCO World Heritage Site, Edinburgh, Lothian, Scotland, United Kingdom, Europe

Medieval Castle and Windmills of Pandeli with stormy weather, Leros Island, Dodecanese, Greek Islands, Greece, Europe

Kilchurn Castle reflected in Loch Awe at dawn in winter, Highlands, 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

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

People on the Badaling section, the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Aerial view of the abandoned ruins of Corfe Castle at sunrise, Dorset, England, United Kingdom, Europe

View of Castle, Balmoral Hotel and Princes Street from Calton Hill, Edinburgh, Scotland, United Kingdom, Europe

Platanos and Medieval Castle of Pandeli, Agia Marina, Leros Island, Dodecanese, Greek Islands, Greece, Europe

View of South Bay looking towards Scarborough Castle, Scarborough, Yorkshire, England, United Kingdom, Europe

The 18th-century Palamidi Fortress citadel with a bastion on the hill, Nafplion, Peloponnese, Greece, Europe