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MEGALITHIC MONUMENTS IN THE NORTH OF PORTUGAL
If you’re looking for evidence of Portugal’s prehistoric civilisations, the megalithic monuments in the north of Portugal are a good place to start. They are not the biggest or most famous dolmens in the country but they are among the most important and fascinating.
Arguably the most significant megalithic monument in Portugal is the Almendres Cromlech near Évora. Its double circle of standing stones is the oldest known in Europe and the largest in the Iberian Peninsular. The 92 stones were erected in several phases during the Neolithic period between 5,000 and 4,000 BC
originally posted by: Solvedit
There was a show on TV about the city of Silves being the real Atlantis. I have never been there and I don't know if they have developed it for tourism geared towards mysterious sites.