Aware of the beauty and richness of its territory, the Communauté de Communes du Pays d’Olmes (pôle projets) encouraged by the services of the DREAL Occitanie submitted in July 2016 its application to engage in an Opérations Grand Site de France (OGS). In November 2016, the French Minister for the Environment, Madame Ségolène Royal, gave her approval for the launch of the Opération Grand Site Montségur.
At the same time, since 2017, the fortress of Montségur has been a candidate for UNESCO World Heritage listing as part of the process initiated by the Aude department with the Cité de Carcassonne and its sentinel mountain castles . This international initiative feeds into the Opération Grand Site, reinforcing their actions and pooling certain projects and protective perimeters.