Rare, prehistoric rock art which could be more than 4,000 years old has been discovered in the Brecon Beacons.
The Bronze Age discovery was made late last year by national park geologist Alan Bowring.
Experts claim the stone probably served as a way marker for farming communities.
Similar stones have been found in other parts of Britain but they are thought to be rare in mid Wales.
Its exact location in the Brecon Beacons is being kept a secret and news of its discovery comes after archaeologists found a similar ancient rock in the Scottish Highlands.
The Welsh stone is about 1.45m (4ft 9in) long and half a metre (1ft 8 in) wide, with 12 cup (hollow) marks of various shapes and sizes on the face.
It now lies flat on the ground but experts say it could have once stood upright... (Video) bbc.com / Link 2 (Photos)