The youngest of Austria’s national parks is also the country’s biggest continuous forest area. Ten million trees make the labyrinthine, fissured karst formations of the Reichraming and Sensen mountain ranges an endless green wilderness. But these mountain forests that were originally almost impenetrable lie in the midst of Austria’s iron industry. For more than a thousand years, it supplied the fuel for smelting iron from innumerable little mines in the region, especially from the Styrian Erzberg.