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View of a section of the Great Wall, UNESCO World Heritage Site, between Jinshanling and Simatai near Beijing, China, Asia

Great Wall of China at Tengger desert sand dunes in Shapotou near Zhongwei, UNESCO World Heritage Site, Ningxia Province, China, Asia

Water Gardens at Sigiriya Rock Fortress (Lion Rock), Sigiriya, North Central Province, Sri Lanka, Asia

Climbers on the Geneva Spur, Solu Khumbu Everest Region, Sagarmatha National Park, UNESCO World Heritage Site, Nepal, Himalayas, Asia

Cardiff Castle with Christmas lights and traffic light trails, Cardiff, South Wales, Wales, United Kingdom, Europe

The walls and old centre of Ibiza town (d'Alt Villa) (Alta Vila), UNESCO World Heritage Site, Ibiza Town, Ibiza, Balearic Islands, Spain, Mediterranean, Europe

Ruins of King Kassapa's Palace at the top of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Old cannon used to defend Russell in 1845, Bay of Islands, Northland Region, North Island, New Zealand, Pacific

Gutenfels Castle, Pfalzgrafenstein Castle, Kaub, Rhine Valley, Rhineland-Palatinate, Germany, Europe

Castillo de la Real Fuerza, La Habana Vieja, UNESCO World Heritage Site, Havana, Cuba, West Indies, Central America

The main square (Trg Svetog Stjepana) of Hvar Town with view to the Spanish Fortress in the background at first sunlight, Hvar, Croatia, Europe

Entrance gate with the old fortress of Corfu Town (Kerkyra) in the background at sunset, Corfu, Greek Islands, Greece, Europe

Man standing outside the Djenne Mosque, the largest mud structure in the world, UNESCO World Heritage Site, Djenne, Niger Inland Delta, Mali, West Africa, Africa

Cannon and green hills, Brimstone Hill Fortress, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

San Felipe del Morro Castle, UNESCO World Heritage Site, San Juan Historic Site, Puerto Rico, Caribbean, Central America

Evening light on the medieval city of La Cite, Carcassonne, UNESCO World Heritage Site, Languedoc-Roussillon, France, Europe

Citadel (Tower of David), Old City Walls, UNESCO World Heritage Site, Jerusalem, Israel, Middle East

A lookout post fortification with a view of the Adriatic Sea, on the City Wall, Dubrovnik, Croatia, Europe

The Fort of Nossa Senhora da Penha de Franca, popularly known as the Fortaleza Ponta da Bandeira, built towards the end of the 17th century to defend the harbour, Lagos, Algarve, Portugal, Europe

Elevated view from Kamerlengo Fortress over the old town of Trogir at dusk, UNESCO World Heritage Site, Croatia, Europe

Remains of buildings at Fort Union National Monument, New Mexico, United States of America, North America

Old wagon wheels with remnants of Fort Union behind, Fort Union National Monument, New Mexico, United States of America, North America

View at dawnfrom the Lovrijenac Fortress over the walled old town of Dubrovnik, UNESCO World Heritage Site, Croatia, Europe

The Lovrijenac Fortress (St. Lawrence Fortress) outside the old town of Dubrovnik at sunset, Croatia, Europe

Defensive city wall and moat across the narrow approach isthmus, Ceuta, the Spanish enclave on the coast of Morocco, North Africa, Africa

Ruins of King Kassapa's Palace in front of the view from of Sigiriya Rock Fortress (Lion Rock), UNESCO World Heritage Site, Sigiriya, Sri Lanka, Asia

Citadelle St. Elme (St. Elme Citadel), Villefranche sur Mer, Cote d'Azur, French Riviera, Provence, France, Europe

Statue of Allan Ramsay with Edinburgh Castle in distance, Edinburgh, Scotland, United Kingdom, Europe

View along the restored section of the Great Wall, UNESCO World Heritage Site, Mutianyu, near Beijing, China, Asia

Ses Taules Gate, Old Town (Dalt Vila), UNESCO World Heritage Site, Ibiza town, Ibiza, Balearic Islands, Spain, Europe

Castle Stahleck above the village of Bacharach in the Rhine valley, Rhineland-Palatinate, Germany, Europe

San Felipe del Morro, UNESCO World Heritage Site, San Juan, Puerto Rico, West Indies, Caribbean, Central America

San Felipe del Morro Castle, UNESCO World Heritage Site, San Juan Historic Site, Puerto Rico, Caribbean, Central America

Old Main Bridge over River Main and Fortress Marienberg behind, Wurzburg, Franconia, Bavaria, Germany, Europe

Ortigia Castle (Castello Maniace) (Castle Maniace), Syracuse (Siracusa), UNESCO World Heritage Site, Sicily, Italy, Mediterranean, Europe

Kotor Old Town, marina and fortifications at dawn with view of the Bay of Kotor, UNESCO World Heritage Site, Montenegro, Europe