The Almendres site is the largest megalithic monument in the Iberian Peninsula and one of the oldest monuments of Humanity.
It was, it would seem, built around 7000 years ago, at the dawn of the Neolithic, the time when the first communities of shepherds and farmers were emerging in Europe.
The Almendres site, whose original layout was, very probably, a horseshoe shape, open towards the east, seems to have been added to and altered: the monument’s current shape, which is relatively complex, is partially the result of these old interventions and, also to more or less recent amputations and disturbances. The monument currently comprises around a hundred monoliths, some of which are decorated.
The choice of the places where the monuments were positioned surely took into account the physical structure of the landscape, especially the river network as well as the most notable astronomical phenomena, relating to the annual movement of the Sun and the Moon on the horizon.