The Wieliczka Salt Mine is one of the world's oldest operating salt mines, located in the town of Wieliczka, just outside of Krakow, Poland. The mine dates back to the 13th century and was in operation until 1996, producing table salt continuously for over 700 years.

The mine is a UNESCO World Heritage Site and is known for its intricate underground passageways, chambers, and sculptures carved from salt. Visitors can take guided tours through the mine and see underground lakes, salt formations, and even an underground chapel.

One of the most impressive features of the Wieliczka Salt Mine is the Chapel of St. Kinga, a subterranean chapel located 101 meters below ground. The chapel is entirely made of salt, with salt sculptures, chandeliers, and even a salt altar.

Visitors to the mine can also learn about the history of salt mining in Poland and the important role that salt played in the economy of the region. The Wieliczka Salt Mine is a popular tourist attraction and a fascinating glimpse into the underground world of Poland's salt mining industry.