Anta da Vidigueira - Credit: Wikimedia Commons
The Anta da Vidigueira is a megalithic dolmen or burial chamber located southwest of the village of Freixo, in Redondo municipality in the Évora district of the Alentejo region of Portugal. The dolmen was probably constructed between the Neolithic and the Chalcolithic (between the end of the fourth Millennium BCE and the first half of the third Millennium). It has been classified as a National Monument since 1910. Read more on Wikipedia
Source: en.wikipedia.org