Anta de Andrenunes Dolmen

Set within the wild landscape of Sintra-Casuais Natural Park, near the Atlantic coast, the Anta de Adrenunes sits at around 426 metres above sea level. That makes it one of the more elevated megalithic sites near Lisbon, though not the highest in Iberia. The structure itself is made up of large granite stones placed upright in a clustered shape, forming what may be a narrow gallery or burial chamber with a debated entrance passage. All around, you’ll find rocky terrain, low coastal vegetation, and wide-open views. Its remote, elevated setting makes it feel very different from most other megalithic sites in Portugal, which are usually located in lower, more sheltered areas. Archaeological and Historical Findings The Anta de Adrenunes dates back to the Neolithic period, roughly between the 4th and 3rd millennia BCE. It was built using large local granite slabs arranged in a clustered layout to form a possible burial chamber. Originally, this chamber would have been covered by a mound of earth or stones, known as a tumulus, but this has mostly disappeared over time. Unlike many other dolmens, it does not have a clear corridor or entry passage, suggesting it functioned as a simple chamber tomb, though its man-made nature is debated among archaeologists. They believe it was used for collective burials and possibly for rituals linked to early farming communities. Its high location may also have had symbolic or territorial meaning, although its main function as a burial site is not fully confirmed.