AMATEUR historians have uncovered 5,000-year-old artwork on stones hidden under thick gorse.
The find in north Donegal is the largest collection of prehistoric rock art in Ireland.
Adam Porter and his wife Angela MacLochlainn are now hoping the discovery can be preserved and marketed to tourists.
Most of the rocks were documented in the 1970s by a Dutch archaeologist. They feature circular markings carved into the rock 3,000 years before Christ. But 40 years of growing gorse had hidden them away.