Musée Claude-Nicolas Ledoux d'Arc-et-Senans, Architecture museum in Royal Saltworks, Arc-et-Senans, France.

The Musée Claude-Nicolas Ledoux occupies the former cooperage of the Royal Saltworks of Arc-et-Senans, a complex listed as UNESCO World Heritage in 1982. Opened in 1991, it holds around sixty scale models and many sketches of Ledoux's projects, from the ideal city of Chaux to Paris tollhouses. The timber-framed hall has exposed beams and trusses, small square windows, and stepped wooden counters with glass cases; one case holds a white model of a low walled complex.

Ledoux designed the saltworks in the late 18th century as an innovative project meant to unite production and architecture. The museum itself opened in 1991 to preserve his artistic legacy and his revolutionary ideas about city planning.

The collection reveals how Ledoux viewed buildings as places where work and society should unite. His designs for theaters, homes, and public spaces reflect his belief that architecture could shape how people lived and interacted.

The museum offers guided tours through various thematic areas that work for both newcomers and architecture enthusiasts. The exhibition spreads across the entire site, so visitors should wear comfortable shoes and plan for two to three hours of exploration.

The architect planned to create an ideal city here where workers could live and work in comfort, a radical concept for the 18th century. Many of his designs for this dream settlement were never built, but the models reveal his visionary thinking today.