photo #6082789

What an incredible feat of Neolithic engineering!Stonehenge is the only surviving stone circle in the world with raised stones, known as lintels. Each lintel is locked to its supporting upright sarsens with mortice and tenon joints, and to its neighbours by tongue and groove joints – techniques more commonly found in woodworking.Further evidence of the care that went into the construction is that the inner and outer faces of the lintels are gently worked to better give the illusion of a continuous ring of stone. Additionally, the tops of the upright stones have been levelled to overcome the effect of the slope on which they are set, resulting in no more than a few centimetres difference in height across the diameter of the circle.