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 …

The exceptionally flat salt plains in southern Bolivia are the largest in the world covering over 4000 square miles. They are rich in minerals and contain around 60% of the world’s Lithium. Extracting and exporting the minerals has been big business and a railroad was constructed by the British in …