Public funding to preserve two abandoned rock salt mines near Cracow, in Poland as cultural heritage sites, was given Commission approval on 14 December 2010. The salt mines, which were active economic concerns from the 13th century to the late 20th century, are now preserved as tourist centres and are listed as UNESCO World Heritage Sites. State funding is required to help supplement the income generated from tourism to conserve the mines and prevent water damage. Approval was given under Article 107(3)(d) of the TFEU, which permits aid for cultural objectives.