Anta das Pedras Grandes — Wikipedia

The Anta das Pedras Grandes (Dolmen of large stones) is a Late Neolithic (between 4500 and 2000 BC) site located in Ramada e Canecas, in the Odivelas municipality, in the Lisbon District of Portugal. Anta is the Portuguese name for about 5,000 megaliths built during the Neolithic period in the area of Portugal. It was classified as a National Monument in 1944. Excavations in the early 21st century suggest that it was originally built as a dolmen or single chamber megalithic tomb, consisting of a polygonal long chamber with eight supporting stones about 3 metres tall, and a short access...