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Grutschgasse 2a
}2236 263 64; www.seegrotte.at
Set in the Vienna Woods, the former gypsum mine is now Europe’s largest underground lake, and attracts more than 200,000…
Zisterzienserabtei Stift Heiligenkreuz
}2258 870 31 38; www.stift-heiligenkreuz.at
While the grounds and courtyards are free to explore, it’s worth taking the tour to see inside this Abbey, currently hom…