Dunmore Cave
Kilkenny, The Municipal District of Castlecomer, Ireland
Dunmore Cave is a limestone show cave in County Kilkenny, where guided tours lead visitors down into chambers formed over millions of years. The cave descends…
What it's like here
Dunmore Cave is a limestone show cave in County Kilkenny, where guided tours lead visitors down into chambers formed over millions of years. The cave descends to depths of 150 feet, revealing passages and calcite formations in an otherwise modest system—just a quarter-mile of walkable routes—but what it lacks in scale it makes up for in character and history.
The visual centerpiece is the Market Cross, a distinctly cross-shaped column of calcite rising over 19 feet high, illuminated as you move through the cool, damp darkness. Stalactites hang from the ceiling while stalagmites rise from the floor, each formation a record of slow geological time. The cave sits in an isolated limestone outcrop overlooking the River Dinan valley, creating a striking natural setting that drew human inhabitants for centuries.
Dunmore's deeper significance lies in its archaeology. The Annals of the Four Masters record a Viking massacre at the cave in 928 AD, in which over a thousand people are said to have been killed. Human remains found within support a grim history, though exactly how many died and under what circumstances remains uncertain—some may have been trapped and asphyxiated when Vikings attempted to smoke them out. In 1999, a hoard of Viking-era silver and bronze items dating to around 970 AD was discovered deep in a rocky cleft, adding another layer to the story.
The cave was designated a National Monument in 1944, but opened as a visitor attraction only in 1967, following the work of archaeologist J. C. Coleman. It was closed for several years around 2000 for archaeological investigation and refurbishment, reopening in 2003. Today it operates as a show cave with a visitor centre, allowing you to experience both the geological wonder and the echoes of a violent medieval past in one descent.
Highlights
- The Market Cross, a 19-foot cross-shaped calcite column at the cave's heart
- Guided tours through limestone passages with stalactites and stalagmites
- Archaeological evidence of a 10th-century Viking massacre and Viking-era artifacts
- Visitor centre with facilities overlooking the River Dinan valley
- Photography permitted during your visit
Good to know
Access is by guided tour only. The experience involves a steep descent into the cave; visits typically take 1–2 hours. The cave is cold and damp year-round, so bring warm clothing and sturdy footwear. Parking, toilets, and a café are available at the site. The cave is seasonal in operation.
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Questions people ask
What is the most striking feature inside Dunmore Cave?
The Market Cross, a distinctly cross-shaped column of calcite over 19 feet high, is the most spectacular formation within the cave.
Is there evidence of the Viking massacre mentioned in the Annals of the Four Masters?
Human remains have been found in the cave and are thought to be victims of the 928 AD Viking massacre, though this connection has not been reliably confirmed. Some remains may belong to people who were trapped and died from asphyxiation when Vikings attempted to smoke them out.
What archaeological finds have been discovered in the cave?
Human remains dating to the medieval period and a hoard of 43 silver and bronze items from around 970 AD have been discovered in the cave, the latter found in a rocky cleft deep within.
How long should I plan to spend at Dunmore Cave?
A typical visit lasts 1–2 hours, with the guided tour itself being the main activity.
Attributes & facilities
Experience
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Last verified: August 16, 2026