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I have an old, out of print, and hard to find map that you would love, a map of a fair number of archaeological and neolithic sites around Ireland. I used it to find a good number that were of interest to me, including Drombeg.

"...right under people's noses."

Indeed, like the (not so old but still quite old) Skellig Michael off the Iveragh Peninsula in County Kerry that only recently was graced by the feet of a certain Skywalker, an act witnessed by millions, unwittingly.

Good location scout.

This stuff is ALL over Europe and people are too busy looking at pyramids in Giza when this is just as fascinating... I think a lot of these places are the refinements of what was older ever BEFORE these structures, that were better built because of pre-Ice age realities. I'm thinking huge monumental things we can only ponder on, now.

We barely know true history... it's far more profound that can be perceived.