The Wieliczka Salt Mine is a historic salt mine located in Wieliczka, Poland, near the city of Kraków. It has been in operation since the 13th century and is one of the oldest salt mines in the world. The mine stretches over 300 kilometers and features underground chambers, tunnels, and lakes, all carved from rock salt. In 1978, the Wieliczka Salt Mine was designated a UNESCO World Heritage Site due to its cultural and historical significance. Visitors can explore its stunning chapels, sculptures, and intricate carvings, all made from salt, showcasing the artistry of miners throughout the centuries.