"Nevertheless, some of the gallery walls are preserved, some behind glass. Behind the glass, you can see the colorful red and blue-green strata that contained the mercury. In some cases, you can see “native mercury” that’s not locked into the ore in compound format. Little globules of the silver poison just sitting there for the taking."
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Tom Bartel and Kris Henning of the Travel Past 50 website do the Idrija mercury mine in Slovenia, with great narration and photos. Here's an extract.
And yup, we even get a snap of the native Hg. Fascinating stuff, top to bottom, with plenty on the nasty, brutish and very short lives of the people who used to work the mine. Go see it here.