A UNESCO World Heritage Site, a plus. Important because so much recent history was seen here from…read morethe Romans, the French appropriation after WW1, the massive number of strikes, the rise of Hitler, WW2, and the closing. Strange how this particular site was not dismantled and sold to the Chinese like the others sites. If you enjoy industrial abandonment as much as I do, then visit. This site is one of mankinds stepping stones to life as we know it today. WONDERFUL, p.s., this is still a project under construction.