There is a cave on the side of the side Gellert Hill near Budapest, Hungary, in which it is said that a monk, possibly St. Istvan, lived his life. It later became a place of worship run by the Pauline monks. In 1951, the communist government arrested the monks and sealed the cave with a wall of concrete. The wall was torn down in 1989, and once more the cave is used as a church. Read more about it at Atlas Obscura. Link
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Guys, Szent István wasn't a monk and most certainly didn't die hiding out in a cave. According to Wikipedia, Szent Iván is said to have lived there, who is a totally different person. So different in fact, that this is probably the first time I'm hearing of him to my shame, as I'm Hungarian.
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