Baden - grotto - Heuriger

Ma' is on spa! We visited her at Baden and then continued our weekend journey into Vienna Woods where we toured the 'Seegrotte' near Hinterbruehl. That's an underground cave system with a large grotto located under a former gypsum mine. In 1912 the mine flooded with 20 million liters of water and became a tourist attraction. During WWII the grotto was used for production of fighter aircrafts (Volksjäger). Before returning to Vienna we had supper at an Heurigen at Perchtoldsdorf.