The Einödhöhle is accessible from April to the end of October. In winter you should refrain from it, so as not to disturb the bats. Equipped with a headlamp you …
The Seegrotte is a former gypsum mine in the Lower Austrian market town of Hinterbrühl, about 15 km south of Vienna, which today - as from 1932 - serves as …
The Seegrotte show mine in Hinterbrühl is a disused gypsum mine with mythical-looking tunnels, a mine or barbara museum and the largest underground lake in Europe.