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Photo credits
- DS Pugh, Wikimedia Commons · CC BY-SA 2.0
- Ian Medcalf, Wikimedia Commons · CC BY-SA 2.0
- Eric Jones, Wikimedia Commons · CC BY-SA 2.0
- Anonymous, Wikimedia Commons · CC BY-SA 2.0
- Alan Fryer, Wikimedia Commons · CC BY-SA 2.0
- habiloid, Wikimedia Commons · CC BY-SA 2.0
- I Love Colour, Wikimedia Commons · CC BY-SA 2.0
Explorer Tom Llanfair Slate Caverns near Harlech lead you through nine man-made chambers cut into a mountain for slate, with tool…
More archaeology and monuments in Gwynedd · All of Gwynedd

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