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White sand beach and turquoise waters in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Turquoise waters and white sand beach in front of Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

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

Brimstone Hill Fortress, 18th century compound, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America

La Chaine and St. Nicholas towers at the entrance to the ancient port of La Rochelle at dusk, Charente-Maritime, France, Europe

Aerial image of Piel Castle (Fouldry Castle) (Fouldrey Castle), a concentric medieval fortification with a keep and three towers, Piel Island, Furness Peninsula, Barrow in Furness, Cumbria, England, United Kingdom, Europe

Old military fortress, Botany Bay National Park, La Perouse, Sydney, New South Wales, Australia, Pacific

Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Views of cruise ships in Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

A storm passes behind Bamburgh Castle with the last light of the day illuminating the rocky shoreline and castle, Northumberland, England, United Kingdom, Europe

Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

Aerial view by drone of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe

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

Hvar Town and tourists at Hvar Spanish Fort (Fortica) at sunset, Hvar Island, Dalmatian Coast, Adriatic, Croatia, Europe

The 15th century Bodrum castle and marina, Bodrum, Aegean coast, Mediterranean Region, Anatolia, Turkey, Asia Minor, Eurasia

The 15th century Bodrum castle and marina, Bodrum, Aegean coast, Mediterranean Region, Anatolia, Turkey, Asia Minor, Eurasia

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

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

Aerial view of Rethymno old town, Venetian Harbour and fortress, Crete Island, Greek Islands, Greece, Europe (Drone)

Lighthouse and historical fortress of Skansin,Torshavn, Streymoy Island, Faroe Islands, Denmark, Europe

View from Lovrijenac Fortress to the city walls of Dubrovnik at sunrise, UNESCO World Heritage Site, Croatia, Europe

Moonlit Bamburgh Castle reflected in still water at dusk, Bamburgh, Northumberland, England, United Kingdom, Europe

Sunlit Venetian Bourtzi Fortress, island, Nafplio (Nafplion), near Argos, Argolic Gulf, eastern Peloponnese, Greece, Europe

St. Mawes Castle, an artillery fort constructed by King Henry VIII near Falmouth, Cornwall, England, United Kingdom, Europe

Fort Lovrijenac (St. Lawrence Fortress) at sunrise, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

Views of Port of Barcelona from the Montjuic Castle old military fortress on Montjuic Mountain overlooking the city, Barcelona, Catalonia, Spain, Europe

Long exposure to record motion in the sea as it washes around black basalt boulders on a beach at Embleton Bay with the silhouette of Dunstanburgh Castle in the distance, Embleton Bay, near Alnwick, Northumberland, England, United Kingdom, Europe

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

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

Torre (Tower) di Ligny, built 1671 as fort, now a Prehistory Museum, on seafront of this northwest fishing port, Trapani, Sicily, Italy, Mediterranean, Europe

Scarborough harbour, marina and castle in south bay, Scarborough, North Yorkshire, England, United Kingdom, Europe

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

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

Elevated view over Korcula's picturesque Stari Grad (Old Town) illuminated at dusk, Korcula Town, Korcula, Dalmatia, Croatia, Europe

Fort Jefferson, Dry Tortugas National Park, Florida Keys, Florida, United States of America, North America

Volcanoes and fossilised sand dune rock structure, Los Escullos, Cabo de Gata natural park, Almeria, Andalusia, Spain, Europe

San Pedro de la Roca Castle, UNESCO World Heritage Site, Santiago de Cuba, Santiago de Cuba Province, Cuba, West Indies, Caribbean, Central America

View to Lovrijenac Fortress (St. Lawrence Fortress), the city walls and Lokrum Island at sunset, Croatia, Europe

Castillo de Jagua (Jagua Fortress), Cienfuegos, Cienfuegos Province, Cuba, West Indies, Caribbean, Central America

Cannon points towards the sea, with St. Eustatius in the distance, Brimstone Hill Fortress, UNESCO World Heritage Site, St. Kitts, St. Kitts and Nevis, West Indies, Caribbean, Central America

View from Lovrijenac Fortress to the city walls of the old town of Dubrovnik and Lokrum Island, Dubrovnik, Croatia, Europe

The old fortress of Corfu Town (Kerkyra) seen from Faliraki Beach, Corfu, Greek Islands, Greece, Europe

Boats moored near Caernarfon Castle, UNESCO World Heritage Site, Gwynedd, Wales, United Kingdom, Europe

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

Fort Lovrijenac (St. Lawrence Fortress) and the coastline from the Old City Walls, Dubrovnik, Dalmatian Coast, Adriatic, Croatia, Europe

View over the Old Town from the New Fortress, Corfu Town, Corfu, Ionian Islands, Greek Islands, Greece, Europe

Mount Orgueil Castle, illuminated at dusk, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

Looking across Embleton Bay at sunrise towards the silhouetted ruins of Dunstanburgh Castle in the distance and the vivid colours in the sky reflecting in the sea and wet sand, Embleton, near Alnwick, Northumberland, England, United Kingdom

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

Brimstone Hill Fortress, 18th century compound, lined with 24 cannons, largest and best preserved fortress in the Caribbean, Brimstone Hill Fortress National Park, UNESCO World Heritage Site, St. Kitts, Leeward Islands, West Indies, Caribbean, Central America

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe

Mount Orgueil Castle, overlooking Grouville Bay in Gorey, Jersey, Channel Islands, United Kingdom, Europe