But don't k-knock it until you've tried it. ( http://www.themodernantiquarian.com/post/32293 )
That Ireland as Atlantis theory seems quite compelling. I listened to an hour of Radio Scotland - near the summit of a north-facing hill - one evening and they broadcast the highlights from a traditional music festival in Denmark. The Danish music was entirely familiar and yet, until then, unheard. It's like Irish music, Scots music, Danish. On that basis I suspect there are also some wonderful megaliths there too.
Rud Kjems has some stuff - but, I think, it's in Danish. These round carved hollows appear there too. Sometimes also in patterns. And then there's the Egvted burial ¬