Peniche Fort. Built by D. João III in 1557 and completed in 1645 by D. João IV, who considered it the main key of the Kingdom by the sea, it stands out in the Peniche Fortress, in addition to the typical star moth, the Bulwark Redondo - the first fortification built on the Peniche peninsula - the Watch Tower, and the chapel of Santa Bárbara. This property saw its space used in a different way according to the needs and historical vicissitudes of each era. Military square of vital strategic importance until 1897, shelter for Boers refugees from South Africa at the beginning of the century. XX, residence of German and Austrian prisoners during the First World War, political prison of the Estado Novo between 1934 and 1974, provisional accommodation of Portuguese families arriving from the former overseas colonies in 1974, and from 1984 onwards the hostel of the Municipal Museum, Fortaleza de Peniche assumes special relevance as an important document of a historical diachrony of a local and national nature.