The saltworks express their value as well for the exceptional architectural quality of the Royal Saltworks of Arc-et-Senans and its participation in the movement of ideas in the Age of Enlightenment. Criterion (i): The Royal Saltworks at Arc-et-Senans is the first architectural complex on this scale and of this standard designed as a place of work. Criterion (ii): The Royal Saltworks of Arc-et-Senans bears witness to a fundamental cultural change in Europe at the end of the 18th century: the birth of industrial society. The remains of the Great Saltworks of Salins-les-Bains are authentic, notably those relating to the old pumps and brine treatment, and testimonies that are very rare in Europe. Protection and management requirementsThe management system of the property is adequate; it has recently been institutionalized with a joint management authority and the guarantee of a management plan being implemented.