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Cardiff’s quarries

March 6, 2018

Dicmortimer's Blog

Inside Lesser Garth Inside Lesser Garth

Did you know that Cardiff has the biggest underground cave system of any city in the UK? I thought not. Uncharacteristically, the authorities do nothing to publicise what could be a unique amenity, attraction and selling point; in fact they go to great trouble to conceal what lies beneath. Why so shy? Well, partly because the labyrinth of uncharted tunnels, hidden chasms, bottomless pits, subterranean lakes and collapsed roofs is extremely dangerous – but mainly because to publicise the caves would draw attention to one of the city’s most shameful and extraordinary secrets: a hollow mountain.

The 210m (690ft) high Lesser Garth in Morganstown is a geological paradise where man has scratched, burrowed, dug and quarried since prehistory. The dolomitic limestones of the ridge of hills either side of the Taff Gorge were in demand as soon as hominids sussed out how to bash them with a flint, containing as…

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