Borgring Viking Fortress Animation
Animation video (unfortunately without narration). It shows the layout and excavation sites. Borgring was located/discovered in 2014. The site opened to the public on June 1, 2016.
This Trelleborg type fortress is located close to Copenhagen, and excavations are ongoing. The remarkable thing about this fortress is that only a bead has been found as a personal effect, and as yet no remains from housing pillars have been located. Pending more discoveries the current hypothesis is that it would seem to indicate that the ring fortress was never completed or used.