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Crac des Chevaliers, Crusader castle, 1150-1250, built by the Knights Hospitaller, Syria, Middle East

Old Town Barbican defensive bastion built in 1498, Krakow (Cracow), UNESCO World Heritage Site, Poland, Europe

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

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

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

Mandalay City Fort and Palace reflected in the moat surrrounding the compound at night, Mandalay, Myanmar (Burma), Asia

An inflated guineafowl pufferfish (Arothron meleagris), on a drop off in Fiji, South Pacific, Pacific

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

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

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

Woman hiding in the entranceway of Mehrangarh Fort in Jodhpur, the Blue City, Rajasthan, India, 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

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

Tourists standing in the main gate of Mehrangarh Fort 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

Doonagore Castle between the village of Doolin and the Cliffs of Moher on the County Clare coast, County Clare, Munster, Republic of Ireland, Europe

Fortified castle walls around the Convent of Christ (Convento de Cristo), UNESCO World Heritage Site, Tomar, Ribatejo, Portugal, Europe

The Thames Flood Barrier between Greenwich and Woolwich on the River Thames, London, England, United Kingdom, Europe

Rumeli Hisari (Fortress of Europe) and Fatih Sultan Mehmet Suspension Bridge, Hisarustu, Bosphorus Strait, Istanbul, Turkey, Europe

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

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

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

Fort Beekenburg, Caracas Bay, Curacao, Netherlands Antilles, West Indies, Caribbean, Central America

Caernarfon Castle, UNESCO World Heritage Site, Caernarfon, Gwynedd, North Wales, Wales, United Kingdom, Europe

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

The spotted porcupinefish (Diodon hystrix), Hawaii, United States of America, Pacific, North America