From the summit of the Great Orme, the landscape looks as peaceful as it is striking – all rolling green hills and farmland stretching out to the blue Irish Sea.
But the headland that rises over Llandudno, Wales has a secret, one that lay buried for thousands of years.
More than five miles (8km) of tunnels run beneath the hill’s surface. Spreading across nine different levels and reaching 230 feet (70m) deep, some are so narrow that only children would be small enough to access them.
These are the tunnels of a copper mine: one that was first dug out some 3,800 years ago and that, within a couple of centuries, was the largest in Britain.
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bbc.com/earth/story/20160420-the-ancient-copper-mines-dug-by-bronze-age-children