1) Museum in Thuringia 
Morassina is an inactive mine in Schmiedefeld, Thuringia, Germany. Today it is a tourist attraction known for its stalactites. ==History== The first recorded mention of the mine dates to 1683, as a source of alum, iron and copper vitriols (sulfates), sulfur, and colored clay. The colours of the stalactites are produced by the minerals in the mine....