Cromeleque da Portela de Modos
Nossa Senhora da Tourega e Nossa Senhora de Guadalupe, Portugal
The Portela de Mogos Cromlech, or stone circle, is one of several megalithic monuments in the Évora District of the Alentejo region in southeastern Portugal. It is believed to date back to the 5th Millennium BCE.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).