It predates Stonehenge by approximately 2,000 years.
The site was accidentally discovered in 1964 by Henrique Leonor Pina while he was mapping local geological formations.
Several of the stones feature 'cup marks' or small circular depressions whose exact ceremonial function remains a subject of academic debate.
One of the prominent menhirs, often called 'Almendres I', is located slightly apart from the main enclosure and appears to be aligned with the sunrise during the winter solstice.
Geological analysis shows that the granite stones were sourced from the immediate surrounding area rather than being transported from great distances.
The site was abandoned for centuries before its prehistoric purpose was rediscovered, leaving it relatively undisturbed by later medieval agricultural development.
Excavations have revealed that the site likely served as a sacred space for ancestor worship and seasonal rituals.
Almendres Cromlech is the largest group of structured megalithic menhirs in the Iberian Peninsula and one of the oldest in Europe. Built between the 6th and 3rd millennia BC, the site consists of nearly 100 granite monoliths arranged in two distinct, semi-circular enclosures. Archaeological evidence suggests the site was constructed in several stages, evolving from smaller stone groupings to the current elliptical layout. The stones are positioned to align with specific astronomical events, indicating a sophisticated understanding of solar and lunar cycles by Neolithic societies. Many of the monoliths feature carved engravings, including representations of the sun, stylized human figures, and geometric patterns. Excavations have uncovered significant artifacts, such as stone tools and pottery fragments, providing insight into the ritualistic and social life of the prehistoric inhabitants. The site is situated on a gentle slope surrounded by cork oak forests, typical of the Alentejo region. Ongoing preservation efforts focus on preventing erosion and damage to the fragile lichen-covered surfaces of the standing stones. Access is provided via an unpaved road that leads directly into the center of the monumental complex.
The elevated path on the eastern side of the enclosure offers a clear vantage point to capture the full elliptical alignment of the stones against the valley.
Wear sturdy walking shoes, as the terrain is uneven, unpaved, and can be muddy or dusty depending on the season.
Bring your own water and sun protection, as there is almost no natural shade directly within the stone circle.
Visit during the shoulder seasons to avoid the intense heat of the Alentejo summers.
Do not attempt to access the site in a low-clearance vehicle if there has been recent heavy rain, as the final stretch of road can become quite rutted.
Do not touch, climb on, or move the stones; strictly remain on the designated paths to protect the site from soil erosion.
