Remains of a salt mine were discovered in Sołonka which was believed to be used during the pre-Slavonic times and was very likely used in the Middle Ages. In the Middle Ages, there was a trade route from Hungary towards Sandomierz, this route was called the royal route. In the Roman period, amber routes led to Sołonka in the 4th-5th century CE. In 2009-2010 a salt cascade was built.[2]