Re: Don't mess with French mayors on planning issues
Another example from this side of the Channel.
Castle Hill, near Huddersfield is a scheduled ancient monument. It's a hill fort (late Bronze Age IICR the excavation report) converted by the Normans into a motte & bailey castle. In the late C19th a pub was built in the bailey & a tower to celebrate Queen Victoria's jubilee was perched on top of the motte - not things you'd get away with now. From what I can remember of my only visit to the pub many years ago it was in quite an attractive Arts & Crafts style, as is the tower.
A few years ago the owners of the pub applied for planning permission for an extension and incredibly - remember that this was inside a scheduled monument - got it. The permission covered a limited amount of demolition. They demolished rather more and TPTB stepped in, stopped work and told them to reinstate using the original materials. They'd (cough) failed to retain the original materials on site (dressed stone in that style is quite valuable) so they couldn't do that. The consequence was that they had to demolish the rest of the building & make good.
Incredibly once in a while there are renewed attempts to get a new pub built on the site quite ignoring the fact that it's still an ancient monument.