The Saline Royale (Royal Saltworks) is a historical building at Arc-et-Senans in the department of Doubs, Eastern France. It is next to the Forest of Chaux and 29.2 kilometres (18.1 miles) to the southwest of Besançon. The architect was Claude-Nicolas Ledoux (1736–1806), a prominent Parisian architect of the time. The work is an important example of an early Enlightenment project in which the architect based his design on a philosophy that favored arranging buildings according to a rational geometry and a hierarchical relation between the parts of the project.
The Institut Claude-Nicolas Ledoux has taken on the task of conservator and is managing the site as a monument. In 1982, UNESCO added the "Salines Royales" to its list of World Heritage Sites, along with the older saltworks at nearby Salins-les-Bains, for their outstanding architecture and testimony to the history of open-pan salt making. The Royal Saltworks is the first architectural complex of this scale to be used for commercial purposes.Today, the site is mostly open to the public. It includes, in the building the coopers used, displays by the Ledoux Museum of other futuristic projects that were never built. Also, the salt production buildings house temporary exhibitions.
The train line from Besançon to Bourg-en-Bresse passes just next to the salt works. The station for Arc-et-Senans is only a few dozen meters from the site.
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