I thought I had seen it all but this is something else
This is the quarry where Michelangelo chose his marble.
It is the major marble supplier in the world.
No wonder it is called white gold. The views are spectacular and it is not for the fair of heart as you will travel up to 45 degree steep angle roads to get there. You must do a tour. ( I suggest the 4x4) cavedimarmortours. The tunnels ( old railroad tunnel ) and the caves are something else ! I didn't think I would enjoy it the way I did but it was absolutely spectacular. If you are anywhere near by in Florence Pisa or cinque terre make the trip it is worth it