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As much of a mystery is how the construction itself was accomplished. Carefully carved lintels were placed on top of pairs of upright stone blocks, held in place by the use of ball and socket joints. These constructions have become known as "trilithons". The final element to be added was the alter block, a large block of green sandstone from South Wales that was placed in front of one of the trilithons.
(right) Close up of stonework on top of trilithon
Over 1500 years had passed since the beginning of construction.. Each generation carefully tended to the monuments, increasing its size as technology to move and finish the large blocks improved. It is almost inconceivable for us, in this age were nothing lasts more than a few decades at best, to image a people maintaining a monument for almost 2 millennia.

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