São João Baptista Fort Peniche, Leiria, Portugal
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Fort of São João Baptista (Berlengas)

The Fort of São João Baptista das Berlengas, or simply known as the Fort of the Berlengas, is located off western coast of Portugal, on the largest island of the archipelago of the Berlengas, in the municipality of Peniche in Oeste region. The fortification belonged to a group of defensive military structures meant to protect the municipality located on the coast.

https://en.wikipedia.org/wiki/Fort_of_S%C3%A3o_Jo%C3%A3o_Baptista_(Berlengas)

Source: http://snnantn.blog115.fc2.com/

Fort of São João Baptista (Berlengas)