M M
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Definitely worth a visit, despite being a bit remote.
If you’re coming from Cluj, take the minibus from town (Podul Traian) and use the OLD entrance to the mine (otherwise you need to take a taxi). You can find the old entrance on Google Maps. It’s a longer walk, but much less of a hassle.
The mine is quite an experience. It’s very unique in that they made it into a amusement park of sorts. Agree with others to try to go off-season (or outside of peak hours)