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Nunney Castle and moat in summer in the village of Nunney, Somerset, England, United Kingdom, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe

Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe

The view from the main courtyard of Mehrangarh Fort towering over the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

View of Roughs Tower, the former defense plattform, a Maunsell Sea Fort, now the Principality of Sealand, North Sea, Europe

Faro de Cíes lighthouse, Isla del Faro island, Cies Islands, Atlantic islands National Park, Galicia, Spain, Europe

St. Mawes Castle, an artillery fortress built by Henry VIII, Cornwall, England, United Kingdom, Europe

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

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Old Fortress, Kerkyra City, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, Europe

Gateway, Fort Frederick, 1675, with Dieu et Mon Droit on coat of arms over arch, Trincomalee, Eastern province, Sri Lanka, Asia

The Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe

The view from Mehrangarh Fort of the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

The view from Mehrangarh Fort of the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

Cannons on ramparts of citadel castle Il-Kastell, Victoria Rabat, Gozo, Malta, Mediterranean, Europe

Commuters leaving work in the La Defense area with La Grande Arche in the background, Paris, France, Europe

Tuk tuks outside The Territorial Defense Command building in Bangkok, Thailand, Southeast Asia, Asia

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

Medieval stone tower on a hill with a clear blue sky in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Genoese tower of granite rocks built as fortress of defense framed by blue sky, Porto, Southern Corsica, France, Mediterranean, Europe

Sunrise and Hadrian's Wall National Trail in winter, looking to Housesteads Fort, Hadrian's Wall, UNESCO World Heritage Site, Northumberland, England, United Kingdom, Europe

The view of Umaid Bhawan Palace from Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

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

Old Fortress, Kerkyra city, UNESCO World Heritage Site, Corfu, Ionian Islands, Greek Islands, Greece, 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

Medieval stone tower on a grassy hill with clear blue sky, flanked by church spires in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe

Spanish colonial fortification, Fort de San Felipe, Bacalar, Quintana Roo, Yucatan Peninsula, Mexico, North America

Old cannon, Ramparts of San Felipe Fort, built in 1733, Laguna Bacalar, Quintana Roo, Mexico, North America

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

Harbour and Fort Carre, Antibes, Alpes Maritimes, Cote d'Azur, Provence, France, Mediterranean, Europe

View of Roughs Tower, the former defense plattform, a Maunsell Sea Fort, now the Principality of Sealand, North Sea, Europe

The Fat Tower (Frauenturm) (Dicke Turm), part of the medieval city defences in Goerlitz, Saxony, Germany, Europe

Porte d'Aude through outer wall of old city, Carcassonne, UNESCO World Heritage Site, Languedoc, France, Europe

High rise office buildings and La Grande Arche in the La Defense area at night, Paris, France, Europe

The view from Mehrangarh Fort of the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

Old City Wall, UNESCO World Heritage Site, Old San Juan, San Juan, Puerto Rico, West Indies, Caribbean, United States of America, Central America

Performance hall in Hue Citadel, The Imperial City of Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia