Brú na Bóinne: Megalithic tomb discovered in Meath

[Imperial Dave]

https://www.bbc.co.uk/news/world-europe-44850668

a little bit early in the timeline but very interesting nonetheless

[Anton]

Yes, its a good one.  You can find the same concentric circle symbol on stones from Perth in Scotland to Monte Tecla in Spanish Galicia.  I think this likely supports Cunliffe and Koch's Celtic from the West trade based theories.  I've often wondered what it represents.