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Battlements, stone ramparts and watch tower in historic castle ruins at Arraiolos (Pavao dos Alcaides), built in the 14th century, Alentejo, Portugal, Europe

The view from Mehrangarh Fort of the blue rooftops in Jodhpur, the Blue City, Rajasthan, India, Asia

Hue Citadel Gates, The Imperial City, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Pagoda in Hue Citadel, The Imperial City of Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

Avenue de la Grande Armee at night with La Defense in the distance from the Arc de Triomphe, Paris, France, Europe

The lifeboat station and cliffs from the beach at Sheringham, Norfolk, England, United Kingdom, Europe

Old building in Hue Citadel, The Imperial City, Hue, UNESCO World Heritage Site, Vietnam, Indochina, Southeast Asia, Asia

San Juan Gate, Old City Wall, UNESCO World Heritage Site, Old San Juan, San Juan, Puerto Rico, West Indies, Caribbean, United States of America, Central America

Birds flying around the towers of the Agra Fort, UNESCO World Heritage Site, Agra, Uttar Pradesh, India, Asia

Djenne Mosque, the largest mud structure in the world, UNESCO World Heritage Site, Djenne, Niger Inland Delta, Mali, West Africa, Africa

Djenne Mosque, the largest mud structure in the world, Djenne, UNESCO World Heritage Site, Niger Inland Delta, Mopti region, Mali, West Africa, Africa

Mursi tribesmen with face and body decoration, Mursi Hills, Mago National Park, Lower Omo Valley, Ethiopia, Africa

Djenne Mosque, the largest mud structure in the world, Djenne, UNESCO World Heritage Site, Niger Inland Delta, Mopti region, Mali, West Africa, Africa

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

Baby Siberian lynx or Eurasian lynx (Lynx lynx) in captivity, Animals of Montana, Bozeman, Montana, United States of America, North America

Gardena Castle, St. Cristina, Gardena Valley, Bolzano Province, Trentino-Alto Adige/South Tyrol, Italian Dolomites, Italy, Europe

Gardena Castle, St. Cristina, Gardena Valley, Bolzano Province, Trentino-Alto Adige/South Tyrol, Italian Dolomites, Italy, Europe

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

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

Aerial of the Fort of San Sebastian, Island of Mozambique, UNESCO World Heritage Site, Mozambique, Africa

Mediterranean Katydid (Phaneroptera nana) on leaves of staghorn sumac (Rhus typhina), France, Europe

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

Fort St. Catherine, built in 1614 to defend sea approaches to the island, now a museum, UNESCO World Heritage Site, St George's, Bermuda, Atlantic, North America

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

Cityscape of Rome featuring the Mausoleum of Hadrian (Castel Sant'Angelo) (Castle of the Holy Angel), a towering rotunda (cylindrical building) in Parco Adriano, UNESCO World Heritage Site, Rome, Italy, Europe

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

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

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

A Spotfin Lionfish flares it's dorsel spines and fins to display threat while laying on a colorful reef at night in the warm clear waters of Papua New Guinea. Lionfish float fearlessly around the reef as they are also one of the most venomous residents there.

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

San Giovanni di Sinis historic tower, drone aerial view of San Marco Cape at sunset, Sardinia, Italy, Mediterranean, Europe

Pennard Castle and Three Cliffs Bay, Gower Peninsula, Swansea, West Glamorgan, Wales, United Kingdom, Europe

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

Pennard Castle and Three Cliffs Bay, Gower Peninsula, Swansea, West Glamorgan, Wales, United Kingdom, Europe

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

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

Centuries Old Cannon, Castillo Del San Salvador in foreground, Castillo Morro in the background, Havana Old Town, UNESCO, Havana, Cuba

Centuries Old Cannons, Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Centuries Old Cannons, Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Centuries Old Cannon, Castillo Del San Salvador in foreground, Castillo Morro in the background, Havana Old Town, UNESCO, Havana, Cuba

Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba

Centuries Old Cannons, Havana Castle of the Royal Force (Castillo de la Real Fuerza), Havana Old Town, UNESCO, Havana, Cuba