Two rusty old Portuguese artillery batteries remain in Sao Vicente Island, Capeverdean Republic. Pictures from www.mindelo.info
A coastal battery at Joao Ribeiro, behind the repair yard Cabnave:

And an AA battery at Alto de Sao Joao, occupied now by some squatter families:

Can anybody ID the guns?
It is not completely surprising there are some fortifications on the island. I suppose they were built during WW2, when the German U-boots sheltered in the bay.
Enjoy,
Nuyt