Where would you go if you had an extra day during your Vienna vacation? Most travellers head for more city sightseeing to nearby cities after they visit Vienna. While right outside Wien, a few top class attractions hide from the mainstream. Here I'm sharing my personal favourites:
Crossing an Underground Lake at Seegrotte Hinterbruehl
At 60 meters below the surface, Europe's largest underground lake spreads across a former gypsum mine. Besides this amazing phenomenon, the grotto was also used by
