The structure brought to light in Lignan is commonly regarded as a fortified village from the Bronze age.

Situated on a rocky hill, at an altitude of 1,546 meters overhanging the Saint-Barthélemy valley, it is a typical example of a naturally fortified place chosen as a settlement in the pre-Roman age.
The entire elliptical area, approximately 60 meters long, was used for the construction of dry masonry structures. A continuous perimeter wall follows the edge of the overhang.

The site can be reached in about 10 minutes on foot with a marked path along the Regional Road 36 which climbs from Nus to Saint-Barthélémy, the visit is free.