The Wieliczka Salt Mines. A thousand feet deep, 200 miles of passageways first dug with hand tools by salt miners beginning in the 13th century when salt was precious as silver. Magnificent carvings in grey salt rocks. Chandeliers carved from salt crystals. There are over twenty separate chapels in the mine dating from the 17th century. I expected the salt to be white, but it varies from all shades of …