Located on the slopes of the Monte dos Almendres in Portugal, is the ancient megalithic site of Almendres Cromlech, also popularly known as the ‘hill of the stone amphorae’.  The stunningly well-preserved site is the most important megalithic arrangement in Portugal and is also believed to be one of the oldest stone circles in Europe.

Source: Almendres Cromlech: The Twin Megalithic Stone Circles of Portugal | Ancient Origins