A mysterious stone in Brecon Beacons has become even more mysterious.
Maen Llia is a standing stone about one kilometer west of Pen-y-Fan.
Standing at almost four meters high its original purpose is unknown though it is thought to date from the Bronze Age.
Because it is so visible from quite a distance it is thought it may have been intended to mark a track way or as a territorial maker.
As recently as the 1940s there was some faint Latin and Ogham (a medieval alphabet) inscribed but the Welsh weather has removed it.
The stone has long had a number of legends associated with it.
One says that whenever a cock crows, the stone will walk off on its own to have a cheeky drink in the River Nedd. Another legend says that it visits the River Mellte on Midsummer morning.
Now however a third legend seems to have emerged.
Hannah Burton, 30, from Swansea , was walking with her children Alys-Miriam and Elwyn when she came across the stone.
She asked them to pose by it for a picture but when she got home her husband noticed something odd about it.
Hannah said: "We went for a walk to some waterfalls and we saw the stone and I asked them to pose in front of it.
"I couldn't see it at the time because the sun was shining on the screen. When I got back I could see that the kids weren't looking at it, you know what kids are like. But when I showed my husband he said 'that rock looks transparent'."
Looking closely at the picture, the lines on the rock match perfectly with the hill lines behind, making it seem like it is see through.
"There's obviously a logical explanation but it's so lovely and magical to look at," added Hannah.
"This photo was taken as a simple snap shot, un-edited, not filtered - just a photo where I couldn't even get my children Elwyn and Alys to even look at me!"
Welsh cave, The Witches Cauldron, full of green water:
How does the stone stay standing up after a thousand years?
Standing up so straight the stone does seem to defy gravity. However it is likely that as much as third of the stone is actually below ground.
