New Advent links to a story about an underground cathedral built entirely of salt by devout Polish salt miners. Simply astounding!!
It may feel like you are in the middle of a Jules Verne adventure as you descend in to the depths of the world. After a one hundred and fifty meter climb down wooden stairs the visitor to the salt mine will see some amazing sites. About the most astounding in terms of its sheer size and audacity is the Chapel of Saint Kinga. The Polish people have for many centuries been devout Catholics and this was more than just a long term hobby to relieve the boredom of being underground. This was an act of worship.
Amazingly, even the chandeliers are made of salt. An act of worship indeed.