The Royal Saltworks, located in Arc-et-Senans, France, is a historic site known for its unique architecture and production of salt. Built in the late 18th century, it was designed by the architect Claude-Nicolas Ledoux and served as a model for industrial facilities of its time. The site is recognized for its innovative design and the role it played in the salt industry. Today, the Royal Saltworks is a UNESCO World Heritage site, attracting visitors interested in industrial heritage and architecture. The complex includes various buildings, workshops, and a museum that showcases the history of salt production and its significance in the region.