The Wieliczka Salt Mine, with its pure-salt chandeliers, began operations in the 13th century, drew tourists as early as the 15th century, and became a United Nations World Heritage site in 1978. This year, it got yet another tourist treatment: It's now explorable via Google Street View.

 

In medieval times, when salt was precious, the mine brought great wealth to Poland. Over the centuries, the men who mined it filled it with religious and historical sculptures and underground chapels alongside their workshops. Older miners taught younger ones how to carve in salt. In modern times, mine officials invited artists to create other sculptures in the mine's passageways.