In 1998 or 1999, Kathy and I visited Romania and went to the salt mine at Turda in the Transylvanian Alps. The mine is very old, and I believe salt was being extracted as early as 900 bce. Tectonic forces have seriously contorted the bedding, and halite stalactites have preferentially grown along some of the bedding planes (see photo). Since our visit almost 20 years ago, the mine has been turned into and underground theme park. Search on “salina turda” to see what the place looks like today.
Harv Salina Turda salt mine in Romania reopens as theme park
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