The salt mine in Wieliczka is a significant tourist attraction and is visited yearly by over a million people. Operation of the mine ceased in 1996, after over 750 years of continuous operation.
It's one of Europe's oldest salt mines and consists of a labyrinth of tunnels of over 124 miles (200 km) spread on nine floors. The deepest is 1,073 feet (327 meters) underground.
In 1978, the salt mine and the old town of Kraków became one of the first of twelve UNESCO World Heritage Sites. In 2013, the salt mine in the town of Bochnia, 16 miles (25 km) east of Wieliczka, was also listed.
There is also the opportunity to see the post office, the church, and the sports hall. Thanks to the unique microclimate in the mine, it is also a treatment center for asthma patients.
You can also stay at Wieliczka Salt Mine's Health Resort, 443 feet (135 meters) underground. The clean air is filled with healthy minerals, which promote physical and mental well-being.