Turda : Romania

Turda (Hungarian: Torda, German: Thorenburg) (population: 55,770) is a city in Cluj county, Romania, situated on the Arieş river.
History
Founded as a Dacian city under the name Dierna, Turda was conquered by the Romans. The castrum established was named Potaissa and became a municipium, then a colonia. In the Middle Ages, Turda was the residence of the Transylvanian Diet. Turda was the site of the Peace of Turda, which guaranteed religious freedom in Transylvania in 1568.
The Romans began extracting salt from the nearby salt mines, which were used for this purpose until their closure in 1932. The mines have been reopened for tourism.