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The site of the Commandants House showing supports for suspended floor system with hot air to heat rooms above, dating from AD138, Cilurnum (Chesters Roman Fort), Hadrian's Wall, UNESCO World Heritage Site, Chollerford, Northumbria National Park, England, United Kingdom, Europe

Entrance to the Imperial Citadel, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Monastery of St. John at Chora, UNESCO World Heritage Site, Patmos, Dodecanese, Greek Islands, Greece, Europe

A walkway, Imperial Citadel, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Ploce Gate and Fort Revelin, Old Town, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

Walls of the citadel, historic former political capital, Hue, central Vietnam, Indochina, Southeast Asia, Asia

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

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

City walls and the Kamerlengo fortress, Trogir, UNESCO World Heritage Site, Dalmatia, Dalmatian Coast, Croatia, Europe

Elevated view over the Old Town, fjord and mountains from the walls of the Kotor Fortress which forms a continuous belt around the Old Town, Kotor, Bay of Kotorska, Adriatic coast, Montenegro, Europe

Ruins of towers and walls of Rayen Citadel, biggest adobe building in the world, Rayen, Kerman Province, Iran, Middle East

Ruins, towers and walls of Rayen Citadel, biggest adobe building in the world, Rayen, Kerman Province, Iran, Middle East

View to the ramparts and medina from the old fort, Essaouira, Atlantic coast, Morocco, North Africa, Africa

Seagulls flying above turret of the old fort, Essaouira, Atlantic coast, Morocco, North Africa, Africa

Bell tower against sky with clouds on top of a church at Agia Mavra Fort, Lefkada, Ionian Island, Greek Islands, Greece, Europe

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

The Byzantine era fortress on Guvercin Ada (Pigeon Island), looking into the Aegean Sea, in the harbour of Kusadasi, Turkey, Asia Minor, Eurasia

The Byzantine-era fortress, illuminated at dusk, on Guvercin Ada (Pigeon Island), on the Aegean coast, in Kusadasi, Turkey, Asia Minor, Eurasia

Lovrjenac Fort and Bokar Tower from Old Town City Walls, Dubrovnik, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

Inside walls of the Berber granary, Agadir Tashelhit, over 700 years old, Anti-Atlas mountains, Morocco, North Africa, Africa

Behind the walls of the Berber granary, Agadir Tashelhit, Anti-Atlas mountains, Morocco, North Africa, Africa

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

Medieval walls of Pembroke Castle (Castell Penfro), birthplace of King Henry VII of England, Pembroke, Pembrokeshire, Wales, United Kingdom, Europe

Ruins of the archaelogical site of Panama Viejo, UNESCO World Heritage Site, Panama City, Republic of Panama, Central America

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

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

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

Abdullah, guide of the Museum, posing at Nizwa Fort, Ad Dakhiliyah Region, Sultanate of Oman, Arabian Peninsula

Aerial of the historic city and the Palace of the Popes, Avignon, UNESCO World Heritage Site, Vaucluse, Provence-Alpes-Cote d'Azur, France, Europe

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

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

Glenveagh castle in the Glenveagh National Park, County Donegal, Ulster, Republic of Ireland, Europe

Part of the 7km long 18th century wall round Lakhpat Fort on the Kori creek looking out at the border between India and Pakistan, Gujarat, India, Asia

Santa Barbara Chapel, Santa Cruz da Barra Fort, Niteroi, State of Rio de Janeiro, Brazil, South America

Ruins, towers and walls of Rayen Citadel, biggest adobe building in the world, Rayen, Kerman Province, Iran, Middle East