The 18th-century Saline Royale (Royal Saltworks), now abandoned, is surely one of the most elegant factories in the world.
The Saline Royale dates back to the early 15th century. 
mnli hypothesis: The Saline Royale dates back to the early 15th century.  premise: The 18th-century Saline Royale (Royal Saltworks), now abandoned, is surely one of the most elegant factories in the world.