Dyserth Lead Mine Carreg Heilin Vein Adit

The entrance to Dyserth Lead Mine is easy to walk past - a modest adit cut into the hillside above Rhyl, unremarkable until you step inside and realize you're walking into 18th-century industrial history. The mine opened up lead and other minerals from the rock face, and what remains is genuinely atmospheric: damp walls, the smell of stone, and the knowledge that people hauled ore out of this darkness for months on end.

It's free to visit, which is frankly brilliant. You won't need more than thirty minutes unless you're the type to spend an hour photographing shadows on wet rock. The adit itself is short - maybe fifty metres in - but it's the kind of place that makes children actually engaged rather than restless. Older kids who've done geography at school will get more from it; younger ones find the darkness mildly thrilling.

If you're staying at Golden Sands Holiday Park or one of the others near Rhyl, this works as a half-hour detour on the way to somewhere else rather than a destination in itself. The walk up to it is pleasant enough, and the views back towards the coast are decent. Go when it's dry if possible - wet rock is slippery rock, and the floor can get boggy. Summer works better than winter simply because you don't want to be fumbling around in a cold mine when daylight's already half gone. It's worth the effort, but manage your expectations. This is archaeology, not adventure.