The mine, built in the 13th century, produced table salt continuously until 2007, as one of the world’s oldest salt mines still in operation.
 
The mine’s attractions include dozens of statues, three chapels and an entire cathedral that has been carved out of the rock salt by the miners.
The Wieliczka mine is often referred to as “the Underground Salt Cathedral of Poland.”
In 1978 it was placed on the original UNESCO list of the World Heritage Sites.

Today, the “Wieliczka” Salt Mine combines many centuries of tradition and modernity, the history of several hundred years and an underground metropolis with extensive infrastructure.
 
Useful information:

There are 20 chambers to visit – the Chapel of St. King is the most brilliant one.

The visit is always conducted under the supervision of a guide.

Temperature underground ranges between 14° and 16° C

There are 800 steps to climb of which 350 at the beginning take you down into the mine. Wear comfortable shoes.