De Monti Castle (Castello de Monti), Corigliano d'Otranto, Lecce, Salento, Apulia, Italy

Ruined Castle (Cromwell's Barracks), used by pirates Don Bosco and Grace O'Malley, Inishbofin Island, Connemara, County Galway, Connacht, Republic of Ireland

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

Ferry Reach Military Cemetery, contains remains of British Army Bermuda Garrison soldiers who died of yellow fever in 1860s, St. George, Bermuda

Castle of the Three Kings of Morro, 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

Centuries Old Cannon Artillery, Castle of the Three Kings of Morro, UNESCO, Havana, Cuba

Centuries Old Cannon Artillery, Castle of the Three Kings of Morro, UNESCO, Havana, Cuba

A view of the industrial and militarized Russian seaport city of Murmansk on the northern shore of the Kola Peninsula, Murmansk Oblast, Russia, Arctic, Europe

The WWII Patriotic War Memorial (known as the Alesha-memorial) in the Russian seaport city of Murmansk, Murmansk Oblast, Russia, Arctic, Europe

North-East district with the Jordanian flag on a 126m flagpole in front of the Raghadan Palace in the background, viewed from the top of Citadel Hill, Amman, Jordan, Middle East

Havana Castle of the Royal Force (Castillo de la Real Fuerza), 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