Not everything in a salt mine is made out of salt (even though in the case of this particular one – Wieliczka in Poland – it most often is), but that doesn’t mean that not everything is interesting. This corridor has devices that facilitate moving on the ceiling and it leads somewhere where there seems to be a lot machinery. All the walls are made of wooden planks, or practically of full trees, which makes it even more unusual. photofree exgif stockphoto