Dachstein (Hoher Dachstein-DE, Dach=roof, stein=rock), part of North Calcaerous Alps (NCA). It consists of Dachstein Limestone and strongly karstic. Due to the nature of karst, cave can be easily developed through the reaction of water with limestone, resulted by the rich cave system, including the Mammuthhöhle (the biggest ice cave in the world). At the bsck of Dachstein, you will find an oldest salt mine in a history, and may be, the one of the most of the picturesque village in the world. Hallstatt.