Dólmen da Orca
Oliveira do Conde, Portugal
The Dólmen da Orca (also known as the Lapa da Orca or the Orca de Fiais da Telha) is a Late-Neolithic megalithic dolmen located in the Viseu District of northern Portugal. It is one of the best-preserved tombs of this type in the area, having a polygonal chamber and corridor in situ. It was originally covered by a mound or tumulus, which has since disappeared.
Archaeological site data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).