But at Montaubin, an apparent lack of coordination between municipal authorities over the status of the site led to the stones being swept away.
The site had been listed as part of a UNESCO world heritage application, The Local reported. However, local planning regulations were not updated to reflect that, per the outlet.
A statement released by the Brittany Cultural Affairs Office said that studies had been conducted there and the land had been designated for commercial use.
A building permit was granted in August last year, Agence France-Presse reported. Mayor Olivier Lepick told the outlet that he had "followed the law" and that the site had low archaeological value.
Louise Chaulin, a spokesperson for Mr Bricolage, told Insider that the company "sincerely regrets" the situation but pointed to the permit it received to build its store.
The UNESCO application, if it goes through, will see the sites more closely regulated.
While Lepick attributed the decision to a mistake with the region's complex zoning situation, Obeltz told The Local that he believed it had been fudged in order to allow the development to go ahead before the UNESCO application is formalized.
"Elected officials in the area and the département are in a hurry to build up anything [there] because once it is classified with UNESCO, it won't be possible anymore," he told the outlet.
