3Wieliczka Salt Mine, Poland

The Wieliczka Salt Mine, located near Kraków, Poland, is not just an underground mine but a vast subterranean world with over 2,000 chambers and miles of corridors. Established in the 13th century, the salt mine was continuously operated until the early 2000s and now serves as a popular tourist attraction. The mine goes hundreds of feet below the surface, and its chambers have been transformed into extraordinary spaces, including chapels, sculptures, and an underground lake, all carved from salt.
One of the most famous chambers is the Chapel of St. Kinga, a magnificent underground church featuring salt-carved altars, chandeliers, and religious figures. The mine’s steady temperature and air quality also make it a therapeutic destination, as visitors with respiratory ailments often spend time here in what’s called “subterraneotherapy.” Wieliczka Salt Mine is a UNESCO World Heritage site, offering a glimpse into the incredible artistry and history of Poland’s underground.