Today I’ll show you what our ancestors were able to build in order to mine iron ore. There used to be a mine here, and in order to continue mining, it was necessary to divert the river. That’s why two parallel tunnels were built, each approximately 1.6 km long. After a few years, however, it turned out that the ore deposit was poor and mining became unprofitable, so it was shut down. And so the r...Show More ▾