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Antarctic fur seal (Arctocephalus gazella) male defending territory, Stromness Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

A weathered stone fort and Portuguese flag flying from flagpole on a small turret, Lisbon, Portugal, Europe

March 1, 2010 - Sabo channel at Haramatsu River with tubular grid dam (slit dam type), for defense and protection against mudflows, with Sakurajima volcano in background, Japan

Carreg Cennen Castle, near Llandeilo, Brecon Beacons National Park, Carmarthenshire, Wales, United Kingdom, Europe

View of the Vicker's gun emplacement outside Stanley, the capital and only city in the Falkland Islands

Old tower (toston), a defence against English pirates at this northwest coast village, El Cotillo, Fuerteventura, Canary Islands, Spain, Europe

Cannon of Castle Cornet, Saint Peter Port, Island of Guernsey, Bailiwick of Guernsey, British Crown dependency, English Channel, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Old castle tower, seaside town of Menton, Alpes Maritimes, Provence-Alpes-Cote d'Azur, French Riviera, France, Europe

Aerial of the Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Adult Nazca booby (Sula grantii) feeding on halfbeak, and defending its catch against a frigatebird, in the Galapagos Island Archipelago, UNESCO World Heritage Site, Ecuador, South America

Cite de Carcassonne citadel, UNESCO World Heritage Site, Carcassonne, Aude, Occitania, France, Europe

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Adelie penguin (Pygoscelis adeliae) adult defending chick against a skua on Torgersen Island, Antarctica, Polar Regions

Castel Nuovo, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, Europe

Battery and ruins of the fort of Portobelo, UNESCO World Heritage Site, Colon Province, Republic of Panama, Central America

Elevated view of the Eiffel Tower, city skyline and La Defense skyscraper district in the distance, Paris, France, Europe

Castell de Sant Nicolau, coastal defense castle tower, Ciutadella, Menorca (Minorca), Balearic Islands, Spain, Mediterranean, Europe

Ovo Castle, the historic Centre of Naples (Napoli), UNESCO World Heritage Site, Campania, Italy, Europe

Oystermouth Castle, The Mumbles, Gower Peninsula, Swansea, West Glamorgan, Wales, United Kingdom, Europe

Antarctic fur seal (Arctocephalus gazella) males defending territories, Stromness Harbor, South Georgia, UK Overseas Protectorate, Polar Regions

View of Cathedral-Basílica de Santa María de Mallorca from Seo Garden, Palma de Mallorca, Majorca, Balearic Islands, Spain, Mediterranean, Europe

City wall and Fortress Bokar, Old Town, UNESCO World Heritage Site, Dubrovnik, Dalmatia, Croatia, Europe

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

La Grande Arche illuminated at dusk, seen from across the ornamental lake, La Defense, Paris, France, Europe

Military chiefs in uniform, with medals, saluting parade of armed forces in Abu Dhabi, United Arab Emirates

La Grande Arche illuminated at dusk, seen from across the ornamental lake, La Defense, Paris, France, Europe

Cannon battery at Historic Fort Sumter National Monument, Charleston, South Carolina, United States of America, North America