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Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East
View of a defence tower and rocky islet of Es Vedra, surrounded by mist, near Sant Antoni, Ibiza, Balearic Islands, Spain, Mediterranean, Europe
View of defence tower and the rocky island of Es Vedra, near Sant Antoni, Ibiza, Balearic Islands, Spain, Mediterranean, Europe
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
Chung Tai Chan Zen Buddhist Monastery built in 2001 by Grand Master Wei Chueh, architect C.Y. Lee, Puli city area, Taiwan, Republic of China, Asia
Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia
Wooden groyne coastal defenses at Porlock Beach, Exmoor National Park, Somerset, England, United Kingdom. Europe
Wooden groyne sea defenses on Bossington Beach at sunset, Exmoor National Park, Somerset, England, United Kingdom, Europe
Weathered wooden coastal defenses on Bossington Beach, Exmoor National Park, Somerset, England, United Kingdom, Europe
Mansudae Grand Monument depicting the Anti Japanese Revolutionary Struggle and Socialist Revolution and Construction, Mansudae Assembly Hall on Mansu Hill, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia
Mansudae Grand Monument depicting the Anti Japanese Revolutionary Struggle and Socialist Revolution and Construction, Mansudae Assembly Hall on Mansu Hill, Pyongyang, Democratic People's Republic of Korea (DPRK), North Korea, Asia
Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe
The Thames Flood Barrier between Greenwich and Woolwich on the River Thames, London, England, United Kingdom, Europe
Nunney Castle and moat in summer in the village of Nunney, Somerset, England, United Kingdom, Europe
View of Roughs Tower, the former defense plattform, a Maunsell Sea Fort, now the Principality of Sealand, North Sea, Europe
Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe
The spotted porcupinefish (Diodon hystrix), Hawaii, United States of America, Pacific, North America
The Ponts-couverts (Covered-bridges) dating from the 14th century and two defensive towers over River Ill, overlooking the Petite France quarter, part of the Grande Ile, UNESCO World Heritage Site, Strasbourg, Alsace, France, Europe
The Alcazaba and Castle of Gibralfaro on Mount Malaga above the old town, Malaga, Costa del Sol, Andalusia, Spain, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
Gateway, Fort Frederick, 1675, with Dieu et Mon Droit on coat of arms over arch, Trincomalee, Eastern province, Sri Lanka, Asia
Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe
Woman hiding in the entranceway of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, Asia
Cannons and green hills, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America
Castell de Bellver, a 14th century castle, Palma de Mallorca, Mallorca (Majorca), Balearic Islands, Spain, Mediterranean, Europe
Cannon in historic castle in medieval village of Marvao, Portalegre district, Alto Alentejo, Portugal, Europe
Trogir's historic Stari Grad (Old Town) defensive walls and harbour, Trogir, Dalmatia, Croatia, Europe
An inflated guineafowl pufferfish (Arothron meleagris), on a drop off in Fiji, South Pacific, Pacific
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
Scarecrow at botanical gardens at Rodalquilar, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe
Old City Wall, UNESCO World Heritage Site, Old San Juan, San Juan, Puerto Rico, West Indies, Caribbean, United States of America, Central America
Medieval stone tower on a hill with a clear blue sky in the background, Clifford's Tower, York, North Yorkshire, England, United Kingdom, Europe
Tourists standing in the main gate of 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