Carnac Stones, France

In a corner of Brittany, there exist rows and rows of standing stones. I read, today, that scientists believe they may be older than Stonehenge. Walking among them is overwhelming. I suspect their positioning is the equivalent of a power grid. Why else would there be so many of them? Legend has it that Merlin turned Roman soldiers into the stones. That seems a little far-fetched. The overview is startling:

What do you think?