Is this one of the 77 Wonders of the World ? Yes, no, vote.
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“The Royal Saltworks of Arc-et-Senans, begun in 1775, was the first major achievement of industrial architecture, reflecting the ideal of progress of the Enlightenment. The vast, semicircular complex was designed to permit a rational and hierarchical organization of work and was to have been followed by the building of an ideal city, a project that was never realized.
The Great Saltworks of Salins-les-Bains was active for at least 1200 years”. More information via the World Heritage Centre.