You may not think of a salt mine as an exciting place to visit, but I’ll swear otherwise. Here’ ‘s a roundup of four salt mines I feel are worth your time and way more than a grain of that mineral.

Wieliczka Salt Mine, Poland

The Wieliczka Salt Mine near Krakow, Poland, earned one of the 12 prestigious spots on the very first UNESCO World Heritage list. Its operations date back to the 13th century, making it one of the most historic and famous salt mines in the world. Operations continued until 2007, more than 750 years. During World War II, the Germans used the mine as an underground facility for war-related manufacturing. Today, it’s primarily a tourist attraction.