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Ming dynasty Jiayuguan Fort dating from 1372, with Qilan Shan mountains in the Hexi Corridor, Gansu Province, China, Asia

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

The Castillo de Jagua fort, erected in 1742 by King Philip V of Spain, near Cienfuegos, Cuba, West Indies, Caribbean, Central America

Castel Nuovo, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, 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

A mother and son on holiday and seated outside the main wall of the medieval castle, Carcassonne, UNESCO World Heritage Site, Aude, Languedoc, France, Europe

Tour de Constance tower and city wall at sunset, Aigues Mortes, Petit Camargue, Department Gard, Languedoc-Roussillon, France, Europe

Ponte Scaligero bridge outside Castelvecchio fortress, Verona, UNESCO World Heritage Site, Veneto, Italy, Europe

Aerial of the Fort of San Sebastian, Island of Mozambique, UNESCO World Heritage Site, Mozambique, Africa

View of pastel coloured villas and Sant'Elmo Castle from Rotonda Diaz, Naples, Campania, Italy, Europe

Alkasaba entrance, Chefchaouen (Chaouen), Tangeri-Tetouan Region, Rif Mountains, Morocco, North Africa, Africa

Ferry to Helsinki, with historic Fortress walls in the background, UNESCO World Heritage Site, Suomenlinna Island, Helsinki, Finland, Scandinavia, Europe

Woman looking through a telescope on the roof of the Ali Pasha Tepelena Fortress at Porto Palermo, Ionian Coast, Albania, Europe

Entrance, Fort San Jose el Alto, 1792, San Francisco de Campeche, State of Campeche, Mexico, North America

Defensive Wall and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Apsara Frescoes on Mirror Wall at Sigiriya Rock Fortress, UNESCO World Heritage Site, Sri Lanka, Asia

La Cite, medieval fortress city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Kremlin Wall with Towers, evening, UNESCO World Heritage Site, Veliky Novgorod, Novgorod Oblast, Russia, Europe

Kremlin Wall with Towers, UNESCO World Heritage Site, Veliky Novgorod, Novgorod Oblast, Russia, Europe

View from below of a man standing in front of the castle of Torre Astura seen through a hole in the wall, Rome province, Tyrrhenian sea, Latium (Lazio), Italy, Europe

The Castle Gate (Burg Tor) in the walls of Rothenburg ob der Tauber, Romantic Road, Franconia, Bavaria, Germany, Europe

Castelvecchio fortress dating from 1355, River Adige, Verona, UNESCO World Heritage Site, Veneto, Italy, Europe

A section of the wall of the Citadel of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Castelvecchio fortress dating from 1355, River Adige, Verona, UNESCO World Heritage Site, Veneto, Italy, Europe

La Cite, medieval fortress city, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Ovo Castle, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, Europe

Tourists visit St. Paul's Hill with ruins of historical Portuguese fortress in Melaka (Malacca), UNESCO World Heritage Site, Malaysia, Southeast Asia, Asia

Defensive Wall and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Defensive Wall and Palace of the Grand Master of the Knights of Rhodes, UNESCO World Heritage Site, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Old city walls, medieval architecture, Rhodes City, UNESCO World Heritage Site, Rhodes, Dodecanese Islands, Greece, Europe

City Wall, originally built in the 12th century, Avila, UNESCO World Heritage Site, Castile and Leon, Spain, Europe

The Castle Gate (Burg Tor) in the walls of Rothenburg ob der Tauber, Romantic Road, Franconia, Bavaria, Germany, Europe

Main gate and fort walls, Qasr al Azraq Fort, where T.E. Lawrence (Lawrence of Arabia) had his headquarters in 1917, Jordan, Middle East

City Wall, originally built in the 12th century, Avila, UNESCO World Heritage Site, Castile and Leon, Spain, Europe

Kremlin Wall with Towers, UNESCO World Heritage Site, Veliky Novgorod, Novgorod Oblast, Russia, Europe

Aerial view of the medieval castle of Vicalvi overlooking the valley with red cross painted on the perimetral wall, at sunset, Vicalvi, Frosinone province, Ciociaria, Latium region, Lazio, Italy, Europe

View over the main River to Marienberg Fortress and St. Burkard church in autumn, Wuerzburg, Franconia, Bavaria, Germany, Europe

Tourists in the dry moat surrounding the city walls and fortress in Rhodes Town, Rhodes, Dodecanese, Greek Islands, Greece, Europe

Aerial view of the medieval castle of Vicalvi, with red cross painted on the perimetral wall, overlooking the illuminated old village at dusk, Vicalvi, Frosinone province, Ciociaria, Latium region, Lazio, Italy, Europe

View over the main River to Marienberg Fortress and St. Burkard church in autumn, Wuerzburg, Franconia, Bavaria, Germany, Europe

Castillo de San Gabriel fortress, guns, Arrecife, Lanzarote, Canary Islands, Spain, Atlantic, Europe

Fortress Wall, Ichon Qala (Itchan Kala), UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia, Asia

Fortress Wall, Islam Khoja Minaret in the background, Ichon Qala (Itchan Kala), UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia, Asia

Cannons, ruins and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Caribbean, Central America

Aerial view of the medieval castle of Vicalvi, with red cross painted on the perimetral wall, overlooking the old village at sunset, Vicalvi, Frosinone province, Ciociaria, Latium region, Lazio, Italy, Europe

City wall and Fortress Bokar, Old Town, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Fortress Wall, Ichon Qala (Itchan Kala), UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia, Asia

Fortress Wall, Ichon Qala (Itchan Kala), UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia, Asia