A dramatic limestone cave system where 300-million-year-old calcite formations meet a dark Viking past — explored by guided tour deep beneath the Kilkenny countryside.
The only way into the cave is a 50-minute guided tour descending 700 steps to a depth of 46 metres. Guides bring the geology and Viking history to life, culminating in the famous 'lights out' moment of total darkness. Highlights include the 7-metre Market Cross — Europe's largest free-standing stalagmite.
Watch a 10-minute audio-visual presentation on the cave's geology and ecology, then explore displays of Viking artefacts including silver hoards, beads, and dress items. The interactive Virtual Museum lets you examine treasures up close, including one of Ireland's most significant Viking finds.
The 12-metre-wide cave mouth sits at the bottom of a steep 20-metre slope — dubbed 'the mouth of a huge beast'. Notice how plant life shifts from grasses at the top to ferns, then liverworts and green algae near the entrance, before disappearing entirely inside.
Just 10 minutes' drive away, this peaceful woodland park offers walking trails, picnic spots, and a deer enclosure. It's where Thomas Moore wrote 'The Last Rose of Summer'. A perfect nature follow-up to the underground adventure.
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