Although humidity is critical in the Crystal Caves, dissolving and destroying the sharp-edged crystals, water can also make the rock salt grow. 

Today, when modern mining technology puts salt on our tables virtually free of charge, it's hard for us to imagine how difficult to obtain, and therefore how valuable, this mineral used to be. 

Legend has it that when Princess Kinga of Hungary was to marry Duke Boleslav of Cracow, her father King Bela gave her a saltmine for her dowry. Before leaving Hungary, Kinga threw her engagement ring into the mine. 

Earth, fire, water…  What made men risk their lives to wrestle with this humble rock that tasted of their sweat?  The salt of the earth. OK, it was a job, guaranteed by Royal Charter, what's more, to pass for ever from father to son. But there's more to it than that.

Wieliczka – The Salt of the Earth is subtitled and dubbed in 30 languages with 5.1 surround sound. Blu-ray Disc High-definition optical disc format for choosing the best image quality (HDTV 1080p) With 5.1 surround sound.