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Alkasaba entrance, Chefchaouen (Chaouen), Tangeri-Tetouan Region, Rif Mountains, Morocco, North Africa, Africa

Jinshanling section of the Great Wall of China, UNESCO World Heritage Site, near Beijing, China, Asia

Sea defences, Newcastle Beach, Mourne Mountains, County Down Coast, Ulster, Northern Ireland, United Kingdom, Europe

Parliament (Orszaghaz) through arches of Fishermen's Bastion (Halaszbastya) at dusk, UNESCO World Heritage Site, Budapest, Hungary, Europe

Rotting upright wooden posts of old sea defences on Winchelsea beach, Winchelsea, East Sussex, England, United Kingdom, Europe

View of the Alhambra at sunrise, UNESCO World Heritage Site, from Albaicin area, Granada, Andalucia, Spain, Europe

Sunlight pouring through arched windows, Fishermen's Bastion (Halaszbastya), Buda, Budapest, Hungary, Europe

View of the Alhambra, UNESCO World Heritage Site, with the Sierra Nevada mountains in the background, at sunset, Granada, Andalucia, Spain, Europe

Parliament (Orszaghaz) and River Danube through arches of Fishermen's Bastion (Halaszbastya), UNESCO World Heritage Site, Buda, Budapest, Hungary, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Night view of Senglea, one of the Three Cities, and the Grand Harbour in Valletta, European Capital of Culture 2018, Valletta, Malta, Mediterranean, Europe

The old defences at Brean Down Fort, Brean Down, with Bristol Channel and Steep Holm Island in far distance, at sunset, Somerset, England, United Kingdom, Europe

View across bay to the island fortress of Capo Passero, Portopalo di Capo Passero, Syracuse (Siracusa), Sicily, Italy, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Glenveagh castle on lake Lough Beagh in the Glenveagh National Park, County Donegal, Ulster, Republic of Ireland, Europe

The Citadel and old town of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Couple with elevated view of harbour, Dalt Vila district and city defence walls, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

The tomb of Pir Ghaus Muhammad, a Sufi saint and Syyed of Lakhpat, half-Muslim and half-Hindu who died in 1855, Lakhpat Fort, Gujarat, India, Asia

Tower of Toston, El Cotillo beach, El Cotillo, Fuerteventura, Canary Islands, Spain, Atlantic, Europe

Medieval town walls, defence towers and spire of St. Olav's church at sunset, Tallinn, Estonia, Baltic States, Europe

Elevated view of harbour, Dalt Vila district and city defence walls at dusk, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

Sea Front Harbour and Kamerlengo Fortress, Old Town of Trogir, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

The Citadel and old town of Bonifacio perched on rugged cliffs, Bonifacio, Corsica, France, Mediterranean, Europe

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

View along cliffs to 16th century Venetian fortress overlooking the Adriatic Sea, Petrovac, Budva, Montenegro, Europe

Old cannons, Skala of the Kasbah a mighty crenellated bastion, 300 metres in length, built on the cliffs to protect the city on its seaward side, Essaouira, historic city of Mogador, Morocco, North Africa, Africa

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

The Citadel and old town of Bonifacio with the marina in the distance, Bonifacio, Corsica, France, Mediterranean, Europe

Rotting upright wooden posts of old sea defences on Winchelsea beach, Winchelsea, East Sussex, England, United Kingdom, Europe

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

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, Leeward Islands, West Indies, Caribbean, Central America

View across the Venetian Harbour, boats moored in front of the Koules Fortress, Iraklio (Heraklion), Crete, Greek Islands, Greece, Europe

View of Fort Oscar and the harbour, Gustavia, St. Barthelemy (St. Barts) (St. Barth), West Indies, Caribbean, Central America

Elevated view of city defence walls and Ibiza Town, UNESCO World Heritage Site, Ibiza Town, Eivissa, Balearic Islands, Spain, Mediterranean, Europe

Parliament (Orszaghaz) and River Danube through arches of Fishermen's Bastion (Halaszbastya), UNESCO World Heritage Site, Buda, Budapest, Hungary, Europe

Sea Front Harbour and Kamerlengo Fortress, Old Town of Trogir, UNESCO World Heritage Site, Dalmatia, Croatia, Europe

Venetian Castle in front of Lefka Ori Mountains (White Mountains), Frangokastello, Chania, Crete, Greek Islands, Greece, Europe

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

Rotting wooden posts of old sea defences on Winchelsea beach at low tide, Winchelsea, East Sussex, England, United Kingdom, Europe

Medieval town walls, defence towers, rooftops of the Old Town, UNESCO World Heritage Site, and Toompea Hill, Tallinn, Estonia, Baltic States, Europe

Defensive walls, Muralla de la Hoya, Alcazaba, Moorish castle, Almeria, Andalucia (Andalusia), Spain, Europe

Bare Island, built in1885 against feared Russian attack at La Perouse in Botany Bay National Park, La Perouse was a Frenchman who came here only six days after the First Fleet in 1788, New South Wales (N.S.W.), Australia, Pacific

Scorpion fish (Scorpaenopsis) have venomous spines for defence, Similan Islands, Thailand, Southeast Asia, Asia