Photo of National Slate Museum, a visitor attraction near Llanberis, Gwynedd, north Wales. — © David Dixon / Geograph · CC BY-SA 2.0

National Slate Museum

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The National Slate Museum occupies the Victorian workshops of the huge Dinorwig quarry at Llanberis, preserved much as the quarrymen left them when work ended in 1969 — foundry, forge and machine shops still in place. It closed in late 2024 for a major redevelopment and was due to reopen in 2026, so check before you travel. Entry is normally free.

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