Drove a couple of hours east to a large saltworks. Salt was a super precious trade good in days gone by, given its importance to food preservation (and thus army rations). The mine was quite large though not much was left of it, and was interesting because they used wells to bring up briny water from below ground, which would then be boiled and the salt shovelled out.
Did the underground tour in French, though with an info sheet so that was OK.
There was also a second saltworks from the 18th century in a town about 20 minutes away which is also part of the listing, so we dropped in there as well. It's now a hotel and they wanted 10 euros each for entry, so we walked straight back out again.
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