Holed stones are a hot topic - I guess they mean what you want them to - but the hole was perhaps for something symbolic to pass through. It might have been enough just to see the full moon through them but the holed stones are also associated with stone rows in the Uk too. Not that anyone will admit though.

I enjoyed your other two film - split into two pieces - about the ancient masonry. Those stones had been worked identically to the way the great Victorians worked stone for the railway bridges in Britain. (And not just railway bridges). Which is a bit strange, really, and implies they were using very similar tools.