There was news in the last fortnight of a discovery of a religious complex on an island which is regarded as being the origin of Greece. The building/s were covered with white marble not available on that island which had to be transported from another by boat. It is estimated that it took around 10000 trips. That the people from those parts c4000bc were not very accomplished seafarers is beyond doubt. Sorry can't do link at mo, I think it was a Cambridge Uni dig tho.