But that henge is a new construct, if I understood it correctly? Never seen anything that even closely resembles the Ancient Nord ruins of Skyrim in real Scandinavia. And I live there AND am an archaeologist... But on the other hand, I don't know Iceland as well as Scandinavia

For instance, they probably had much more stone architecture due to the lack of trees. Again, henges are a neolithic thing (like Stonehenge), and Iceland wasn't settled until early medieval times.
Really? That's interesting. Have always had a knack for history myself, and archaeology was one of my biggest childhood dreams. (If I can say so when I'm fourteen

)
Are you an expert on Norse history then? One of my favorites, my ancestors keep fascinating me.
Anyway, on topic. That's a great find, OP. A beautiful example of Aurora Borealis, over some fascinating stone structures.
I think Bethesda did the Northern Lights pretty well on this game really. It is something which is hard to recreate, but I think they did it quite good. Nothing beats the real thing though.