Castle of Almourol

The Castle of Almourol is a medieval castle atop the islet of Almourol in the middle of the Tagus River, located in the civil parish of Praia do Ribatejo, 4 kilometres from the municipal seat of Vila Nova da Barquinha, in Portugal's Centre Region. The castle was part of the defensive line controlled by the Knights Templar, and a stronghold used during the Portuguese Reconquista.

Source: Wikipedia