It is called the Ales Stenar, or Ales Stones, and much mystery surrounds it. There is local legend that claims it to be the burial site for the mythical King Ale - hence the name of the stones - and that he lays in his tomb beneath the Viking era ship monument.
Whatever the reason for its construction, it has stood there as it stands today. Over 1400 years old. Since the end of the Swedish Iron Age. But does it have a bigger tale to tell? Have modern archaeologists unravelled an even more ancient mystery at the Ales Stones?
Questions have long been asked of the stones and the reasons for them being there. Could they be older than Late Iron Age? Could they have been moved from somewhere else? An older site perhaps? And what is the cause and explanation of the distinctive cut marks that flaw the weathered surfaces of those massive 1800 kg (4000 lb) megaliths?
In 2006, archaeologists threw some of their modern resources at the monument. Using magnetic sensors and radar, they scanned beneath the Ales Stones and came up with a larger structure. A circle, 541 feet (165 m) in diameter, with a 65-foot by 25-foot rectangle in the centre.
Going forward in time to late October 2012, they finally dug a small trench at the site.
What they found rewrote the history of the stones and the history of the local area.
Quite possibly, it is older than Stonehenge.
While they have some answers as a result of this dig, I think it is without doubt that the mysteries surrounding these amazing stones have only gotten deeper. The more ancient the site, the slower it will be at giving up its secrets.