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

Drone view of Trigonion Chain defensive Tower and fortifications at upper town of Ano Poli in Thessaloniki, Greece, Europe

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

Valletta, Malta 18th century Baroque architecture Fort Manoel by sea, star bastion fortification north west of Maltese capital.

Aerial drone view of Spinalonga, deserted leper colony with fortifications, currently a tourist attraction, in Crete island.

Aerial view of Goodrich Castle and the River Wye near Ross on Wye, Herefordshire, England, United Kingdom, Europe

The magnificent ruins of Carew Castle reflected in the Mill Pond in spring, Carew, Pembrokeshire, Wales, United Kingdom, Europe

Ancient fortress (Ksar), Ait Ben Haddou, UNESCO World Heritage Site, Ouarzazate province, Morocco, North Africa, Africa

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

Castillo de Colomares, a castle monument dedicated to Christopher Columbus, Benalmadena, Andalusia, Spain, Europe

View of the fortified old village and surrounding mountains, Telouet Kasbah High Atlas, Morocco, North Africa, Africa

View of the abbey from the ramparts of Mont-Saint-Michel, UNESCO World Heritage Site, Manche department, Normandy region, France, Europe

Entrance to the Alcazar of Seville at the Puerta del Leon (Gate of the Lion), the main access point through the outer wall, UNESCO World Heritage Site, Seville, Andalusia, Spain, Europe

The palm-fringed Torre della Polveriera, a historic stone watchtower in Piazza della Juharia atop the Old Town walls, Alghero, Sassari, Sardinia, Italy, Mediterranean, Europe

Ruined cells of penal colony on Ile Saint-Joseph, Iles du Salut (Islands of Salvation), French Guiana, Overseas department and region of France, French Guiana, South America

Castillo del Morro (Castillo de los Tres Reyes del Morro) (El Morro), Havana, Cuba, West Indies, Caribbean, Central America

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

Grinzane Cavour and Monviso at sunrise during autumn, Cuneo, Langhe and Roero, Piedmont, Italy, Europe

Serralunga d'Alba and its castle with vineyards at sunrise in backlight in autumn, Cuneo, Langhe and Roero, Piedmont, Italy, Europe

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

Dolbadarn Castle and the Llanberis Pass, near Llanberis, Snowdonia National Park (Eryri), North Wales, United Kingdom, Europe

Evening atmosphere in Carcassonne, Languedoc-Roussillon, France. Walls, towers and ramparts of the the Cite de Carcassonne which is a UNESCO World Heritage Site.

Evening atmosphere in Carcassonne, Languedoc-Roussillon France. Walls, towers and ramparts of the the Cite de Carcassonne which is a UNESCO World Heritage Site.

An early morning view of the cliffs at Berry Head, the southernmost point of Torbay, with one of two Napoleonic era forts on the headland, at Brixham, Torbay, Devon, Great Britain.

View of Hishi Yagura and Hashizume-mon Gate, Kanazawa Castle, Kanazawa City, Ishikawa Prefecture, Honshu, Japan

View of Old Fortress of Corfu in Corfu Town, UNESCO World Heritage Site, Corfu, Ionian Sea, Greek Islands, Greece, Europe

View of Old Fortress of Corfu in Corfu Town, UNESCO World Heritage Site, Corfu, Ionian Sea, Greek Islands, Greece, Europe

San Carlos Bastion housing the City Museum, Defensive Wall of the Old Town, Campeche City, Campeche State, Mexico

San Carlos Bastion housing the City Museum, Defensive Wall of the Old Town, Campeche City, Campeche State, Mexico

The Old Dock Buildings at Bormla Waterfront with Fort St. Michael Clock Tower in the background at d, Cospicua, Malta

Aerial view over Saint Michael's Mount, Marazion, near Penzance, Cornwall, England, United Kingdom, Europe

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

Ksar of Ait-Ben-Haddou, UNESCO, Ounila River valley, Ouarzazate Province, region of Draa-Tafilalet, Morocco

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

Castel Sant'Angelo (Mausoleum of Hadrian) seen from Janiculum Terrace at sunset, Rome, Lazio, Italy, Europe

Ponte Castelvecchio, Castelvecchio brick and marble bridge with arches on the River Adige, Verona, Veneto, Italy, Europe

View of the City of Turin from the Castle of Rivoli (Castello di Rivoli), a former Residence of the Royal House of Savoy, housing the Museo d'Arte Contemporanea (Museum of Contemporary Art), Rivoli, Metropolitan City of Turin, Piedmont, Italy, Europe

The Castle of Grinzane Cavour with Monviso Mountain in the background, UNESCO World Heritage Site, Langhe, Piedmont, Italy, Europe

A weathered stone fort and Portuguese flag flying from flagpole on a small turret, Lisbon, Portugal, Europe

Firemen in training on the ramparts of Mont-Saint-Michel, Manche department, Normandy region, France, Europe

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

Fort St. Catherine, built in 1614 to defend sea approaches to the island, now a museum, UNESCO World Heritage Site, St George's, Bermuda, Atlantic, North America

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

View of the Akershus Fortress from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

View of the Akershus Fortress from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

View of the Akershus Fortress from inside the walls on a sunny day, Oslo, Norway, Scandinavia, Europe

Havana Castle of the Royal Force (Castillo de la Real Fuerza), UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe