Some of the most mysterious graves of prehistory are the so-called ‘stone-packing graves’ from the Neolithic period, constructed between 3100-2800 BC.  These consist of depressions packed with stones (thus the name), located beside a small ‘mortuary house’. The structures are covered by a layer of stones. The ‘graves’ are often placed beside one another or in long rows. A single row of stone-packing graves near Skive reaches a length of almost 1700 metres!