The Fort of Lagarteira (Forte de Âncora/Forte da Lagarteira) was probably constructed between 1640 and 1668, during the Restoration Wars to protect the Portuguese coast from Spanish attacks. Its structure followed the models established in the era for the construction of fortresses implanted along the Alto Minho area, which was an advance in military defensive fortifications. Engineer Bastos Moreira cites 1690 as the date of its construction, under orders of King D. Pedro II.
Work to improve the stability and consolidate the structure was carried-out in the early 1980s, while the spaces were electrified after 1997 to provide illumination to the site.
Its plan consists of four lateral bastions and accentuated battery, with three of the sides crowned by roof. The walls are grounded in the rocky coast, with its extension circled by a curved frame anc crowned by battlement, only interrupted by corner bartizans (crowned by circular roofs over plinths and cannon emplacements along the battery. Along the northern bastion is a closed balcony wall (typical of medieval designs) on three canals and with culverts. At the centre of the flat facade of the frontispiece is the arched portico surmounted by the coat-of-arms of Portugal and lateral volutes.
In the interior, is a small square framed by three constructions covered by rooftile with ramps providing access to adarve and rooftops. The quarter include vaulted ceilings and fireplaces.
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