I visited last summer at the insistence of my wife and kids. I was shocked how much I got out of it. If you are in the area, do not miss it.
We visited Newgrange in the 1990’s. Had never heard of it, but we were staying at a B&B close to there and they told us about it. We were the only people taking the tour that morning (it was a rainy day in October) and being there in the solitude sent chills down my back. It just felt so ancient. If you can go in the off-season when it’s not overrun with tourists, it’s well worth the visit!