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Puerto del Tierra, Fortified Colonial Wall, Old Town, UNESCO World Heritage Site, San Francisco de Campeche, State of Campeche, Mexico, North America

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

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

Hardknott Roman Fort, Hardknott Pass, Lake District National Park, UNESCO World Heritage Site, Cumbria, England, United Kingdom, 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

Fishing boats and view towards ramparts and ruins of the medieval fortification walls, Nessebar, Black Sea, Bulgaria, Europe

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

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

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

Fortified Colonial Wall, Old Town, UNESCO World Heritage Site, San Francisco de Campeche, State of Campeche, Mexico, North America

Greek Fortifications, southern city wall, Valle dei Templi (Valley of Temples), UNESCO World Heritage Site, Hellenic architecture, Agrigento, Sicily, Italy, Mediterranean, Europe

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

View of Old Town Gate and fortified walls in the old town at dusk, Alcudia, Majorca, Balearic Islands, Spain, Mediterranean, Europe

Harbour and Old City Walls at dusk, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

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

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

Minceta Fort and Old Town Walls at dusk, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, 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

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

View of the the Old Town, UNESCO World Heritage Site, from the Toompea (Upper Town) wall, Tallinn, Estonia, Baltics, 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

Summer dawn, Corfu Town fortifications and harbour from the sea, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

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

Old Town, ringed by defensive City Walls and Forts, from the sea, Dubrovnik, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

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

Elevated view, Old Town and Lokrum Island from Minceta Tower, Fort on City Walls, Dubrovnik, UNESCO World Heritage Site, Croatia, Europe

Hindu shrine for parents praying for children at the entrance to Upperkot Fort, Junagadh, Gujarat, India, Asia

Arrow headed fortification wall of the old Phoenician city dating from the 3rd millennium BC, Byblos, UNESCO World Heritage Site, Lebanon, Middle East

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Two men walk along the side of the Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

Tourists walk the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

The ancient Great Wall of China snaking through mountains at Mutianyu, north of Beijing (formerly Peking)

Tourist takes a photograph on the ancient Great Wall of China at Mutianyu, north of Beijing (formerly Peking), China

Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America