The sun sets on an old clearance cairn on Kinnekulle mountain.
Kinnekulle, "the Mountain in Bloom", is a truly mythical place with a long and fascinating history. Not only has it played center stage in Geatish and early Swedish history, but it seems to also have been considered a sacred site of religious importance to at least two different religions - Old Norse Paganism and Catholic Christianity. If you consider the impressive Bronze Age petroglyphs to be found on and near the mountain and their possible religious significance, the religious importance of Kinnekulle could stretch even further back into the mists of time.
Wherever in Västergötland you happen to be, plateu mountains such as Kinnekulle, with their many layered strata of different minerals, and their flat, table-shaped silhouettes, dominate the horizon (and are more or less unique for the region ... unique in Sweden, that is) .
In an effort to explain their creation, role or importance, the plateau mountains have had many myths and stories tied to them (as is often the case with geographical and topographical formations or landmarks that defy logic or dominate the landscape). Thus, Billingen and the other West Geatish mountains of the same type have been an ever-present motif in the worldview of locals from past generations and of bygone eras.
One theory would even have it that the mountains have given the many Neolithic passage graves of the region their form. According to this theory, the Neolithic belief was that the magic of the distant hills were transferred to the graves by building them in the same approximate shape, and from the same materials. Thus, diabase (the hard volcanic rock that forms the upper stratum of the plateau mountains and protects the lower stratas from erosion, giving the mountains their flat-topped appearance) was also used to form the lids of the passage graves. The stones used for walls were instead from less durable minerals, such as slate and sandstone, which also happen to form the lower layers of the plateau mountains.
On the other hand, the simpler explanation for this same practice is that Neolithic man, being perceptive and resourceful, used diabase for the lids because of its durability - a durability they had observed on the mountain tops. No magical explanation needed.