> The structure was spotted this week by drone enthusiasts recording footage over the Newgrange historic site in Boyne Valley, County Meath. The UNESCO World Heritage Site is home to several 5,000-year-old circular structures from the Neolithic era, many of which remain buried underground.
Add in the fact that these are educated researchers, and the odds seem pretty good that this is more than just a really weird circular water ditch with a segmented appearance.
Add to that the fact that this area is dense with Neolithic remains: this is just one more to add to the list. And in Ireland there is no tradition of circular irrigation structures, let alone interrupted circles! It could, of course, be a unique and bizarre folly from a more recent period. But given the location and the fact that henges are a known phenomenon, that can really be ruled out.
Add in the fact that these are educated researchers, and the odds seem pretty good that this is more than just a really weird circular water ditch with a segmented appearance.