Idrija isn’t a one of the more popular spots in Slovenia, but I wanted to visit the mercury mine, which was given World Heritage designation in 2012. Interestingly, this World Heritage Site is shared with Spain! The other half of the site is a mercury mine in the city of Almadén.
The mine, which was built in the 15th century, was fully functional as late as 1986.
You can still see oxidized mercury in the walls.
