Celtic Expansion across Europe; these people were not just found in Ireland where the majority of their populations are. They were even found in the Roman Empire and they even Looted Delphi in 279 B. They were forced west due to Germanic Tribes.
A computer graphic shows the concentric rings that may have existed during Atlantis' ancient heyday. Scientists have seen evidence of submerged structures beneath the vast marshlands of southern Spain's Dona Ana Park.