Of all the tentative listed sites I have visited as of yet, this is easily the most deserving of a whole heritage status. The slate industry is not currently represented atall by UNESCO and after driving through towns completely made with slate (the roofs, fences, gravestones and pretty much anything else you could think of) we visited the mines, which were even more fascinating. I don’t often want to return to many places, but this is one I definitely look forward to going back to, even if it’s just for their underground trampoline park! My 2 year old daughter and newborn son were also allowed down with my partner and I, but the whole time we felt completely safe, so do not worry about anything if visiting!