Mine shafts and mineral workshops from 5th BC to 19th AD

Location: https://goo.gl/maps/iPPj3FhXEicFxD4o7
In case you decide to visit the area be sure to NOT take children or pets with you cause there's a lot of open mine shafts. Be VERY careful while walking around cause many of them are hidden by vegetation and are deep enough so that once you fall in you can't make your way up even if you survive the fall. There's no one around and don't expect to have cell signal at the bottom.