Many ancient flint tools were discovered on the mound's surface - neolithic knives, axes, arrows, or spear blades. Then the circles of pillars were uncovered - geomagnetic soundings showed that at least 20 circles, grouped in one place still need to be unearthed. The work continues and will probably take at least another couple of decades. Archaeologists have had to remove vast amounts of soil to expose the structures underneath and try to answer the question, who built this and why?
