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Entrance to the 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

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

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

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

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

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

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

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

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

Remains from Bar Hill Fort, Antonine Wall, UNESCO World Heritage Site, Scotland, United Kingdom, Europe

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

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

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

Ancient wall of the Fort Silver Indian Ruins overlooking Silver Creek Canyon in Agua Fria National Monument of Arizona

Ancient wall of the Fort Silver Indian Ruins overlooking Silver Creek Canyon in Agua Fria National Monument of Arizona

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

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

Meadow between 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

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

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

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