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Castle of the Three Kings of Morro in foreground, UNESCO, Havana Skyline in the background, Havana, Cuba

Adult great skua (Stercorarius skua) being harassed by Arctic terns (Sterna paradisaea) guarding their nest sites, Svalbard, Norway

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

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

St. David's Battery, UNESCO, four guns installed 1910 by British to defend deep water channel leading to Royal Navy Dockyard and Hamilton, Bermuda

View from Arc de Triomphe at sunset, with La Defense in the distance on the right, Paris, France, Europe

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

A view of a nuclear powered submarine in the industrial and militarized Russian seaport city of Murmansk, Murmansk Oblast, Russia, Arctic, Europe

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

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

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

A view of a nuclear powered submarine in the industrial and militarized Russian seaport city of Murmansk, Murmansk Oblast, Russia, Arctic, Europe

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

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

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

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

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

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