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Paleokastro, Old Castle Ruins, Ancient Porphyris, Mandraki, Nisyros Island, Dodecanese, Greek Islands, Greece, Europe

Kolona Harbour, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Historic cannons on the town wall of Alghero, Sassari province, Sardinia, Italy, Mediterranean, Europe

Autumn colours seen through an arch on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

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

Kolona Harbour, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Porta San Paolo (St. Paulus Gate), Roman Aurelian Walls (Mura Aureliane), UNESCO World Heritage Site, Rome, Latium (Lazio), Italy, Europe

Aerial landscape view of Sighnaghi's Old Town walls, Sighnaghi, Kakheti, Georgia (Sakartvelo), Central Asia, Asia

Defensive Wall and the Clock Tower, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Roman Aurelian Walls (Mura Aureliane), UNESCO World Heritage Site, Rome, Latium (Lazio), Italy, Europe

Parliament (Orszaghaz) and River Danube through arches of Fishermen's Bastion (Halaszbastya), UNESCO World Heritage Site, Buda, Budapest, Hungary, Europe

View of Bastion, cannons, ramparts, Cathedral and Dalt Vila old town at dusk, UNESCO World Heritage Site, Ibiza Town, Balearic Islands, Spain, Mediterranean, Europe

Kolona Harbour, Medieval Old Town, Rhodes City, Rhodes Island, Dodecanese, Greek Islands, Greece, Europe

Roman Aurelian Walls (Mura Aureliane), UNESCO World Heritage Site, Rome, Latium (Lazio), Italy, Europe

Roman Aurelian Walls (Mura Aureliane), UNESCO World Heritage Site, Rome, Latium (Lazio), Italy, 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

Tower, Outer Wall of Tosh HovIi Palace, Ichon Qala (Itchan Kala), UNESCO World Heritage Site, Khiva, Uzbekistan, Central Asia, Asia

Autumn colours and a watch tower on The Great Wall of China, UNESCO World Heritage Site, Badaling, China, Asia

View of Bastion, cannons, ramparts, Cathedral and Dalt Vila old town at dusk, UNESCO World Heritage Site, Ibiza Town, Balearic Islands, Spain, Mediterranean, 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

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

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

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

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

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

View from the Roman wall of Lugo and its Cathedral, UNESCO World Heritage Site, Lugo, Galicia, Spain, Europe

Early morning aerial of the walled city, Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

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

Marine Gate, Rhodes Old Town, UNESCO World Heritage Site, Rhodes, Dodecanese Island Group, Greek Islands, Greece, Europe

View from the Roman wall of Lugo and its Cathedral, UNESCO World Heritage Site, Lugo, Galicia, Spain, Europe

View of cannons, Dalt Vila and Cathedral, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

View of Dalt Vila and Cathedral, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

View from the Roman wall of Lugo and its Cathedral, UNESCO World Heritage Site, Lugo, Galicia, Spain, Europe

View of cannons, Dalt Vila and Cathedral, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

Early morning aerial of the walled city of Avila, UNESCO World Heritage Site, Castilla y Leon, Spain, Europe

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

Old Town Wall and Barbican, UNESCO World Heritage Site, Warsaw, Masovian Voivodeship, Poland, Europe

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

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

View from the Roman wall of Lugo and its Cathedral, UNESCO World Heritage Site, Lugo, Galicia, Spain, Europe

View of cannons, Dalt Vila and Cathedral, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, 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

View of Soportales del Rastrillo in Dalt Vila, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

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)

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)