Anta da Barrosa

A Neolithic megalithic dolmen in Vila Praia de Ancora, Caminha municipality, Viana do Castelo District, Portugal, dating to the late 4th millennium BC. Also known as Lapa dos Mouros, it is the largest and best-preserved megalithic monument in the Vale de Ancora. The chamber consists of nine interlocking stones forming a corridor leading to the burial area. First excavated in 1879 by Francisco Martins Sarmento, who discovered decorative serpentine motifs and U-shaped signs on three slabs. Classified as a National Monument since 1910.