Though the stone setting is marked on OS maps as a circle, it was originally thought to be a burial chamber. The single large upright stands 1.5 metres high and over a metre wide. If it forms part of a circle, the two recumbent stones suggest a circumference around 30 metres.
At the opposite extreme of the circle is a grouping of 4 more stones. There is what seems to be an entrance opening in the south-east section, with portal stones on either side of the opening. The use of portal stones is rare in this part of Wales.
Visiting
I remember two main things about visiting Pen Y Beacon. The first was that our visit was a complete accident. I was driving from Hay to Llanthony Priory with my son, when I spied a standing stone by the side of the road. I uttered an exclamation along the lines of 'Hey! What's that?', and pulled over in the convenient parking area. I quickly discovered what 'that' was. The other thing I remember was the simply stunning setting. The land falls away to the north and west, and the views deeper into Wales are simply staggering. What a location!It won't take long to explore the stones, even if you are passionate about stone circles, but that's more than made up for by the superb setting.