Hi,
there're many people interested in ley lines here in Brittany and in France too.
Near my town there's an old chapel on the top of the biggest hill around the area (a sacred place since the Celtic era). One of the central tiles of the chapel ground is white instead of grey and some locals told me that they could feel magnetic forces when standing there.
As the chapel is only open the "tourist days", I've never been able to concentrate enough to feel anything
When I was 20, in Northern France, the father of a friend used to talk a lot about ley lines, specially after a few glasses. He could have shown you lines going from a tumulus to an abbey or from a "Celtic" stone to a church on any map of the county.
Once, after he had siped the full content of a bottle of brandy, he told all our family to follow him, walked to the churchyard and started to fall into transe, standing behind the church, between the graves and shaking all over while shouting "I can feel it! I can feel the power of the Druids!"
It was All Saints Day, the day before the Day of the Deads*, everybody in village was there cleaning the graves and after that they were convinced we were part of a kind of satanic sect
* Halloween festival wasn't known yet in France.