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The Columns

The Columns is a spectacular cave formation in Ogof Ffynnon Ddu II (OFD) cave. A lime kiln,which had been built above the cave and operated a hundred and fifty years ago, caused lime to seep through the ground with rain water and drip through the roof of the cave forming these colourful formations – the Columns are technically ‘industrial waste’.
'The Columns' Ogof Ffynnon Ddu cave, South Wales, UK'The Columns' Ogof Ffynnon Ddu cave, South Wales, UK