They are indeed all over the place, I have seen lots of people sheltering in them and I have sheltered in many myself, from wind, rain and snow blizzards, they offer much more shelter than none at all.
Of course I have no proof that this was rebuilt by modern people sheltering from the elements, other than the wall being much higher than all the other hut circles.
I can imagine someone and his mate doing a bit of wild camping on a hill with things on it, but not really realising it's bad to remodel ancient structures.
If they're not walker shelters what else could they be?
I have only ever seen these old structures referred to as "walkers sherlters" on TMA. I have seen these strange enclosures from Skye to Wales. I have never, ever seen a walker shelter in one. Not have I ever sheltered in one. They don't offer any shelter at all.
Oh no! That is waaaay too steep! The slope looks almost vertical from the cairn! The road North to Caernafon is miles below! Go further round the road towards Llithfaen (turn off at Llanaelhaearn) and stop the car or get off the bus around here.
Through the little gate and up the signposted footpath on the right of the road in the link. It is a steep stretch for ten minutes then it is a lovely level walk across the moor till you clamber up and through the South West Gate into The Best Hillfort In The World. Very recommended.
Me and my wee family ate our lunch on that rugged outcrop looking out at Mynydd Carngwch with our sangwidges last September. There's quite a lot of carving on the outcrop, none of it seemed very old, but at least they weren't more drillholes! I loved this hillfort, the best I've ever been in anywhere. It really is more of a hill city. Unbelievable place. Nowhere like it. And don't be put off by the staggering views... it really is very straightforward to walk to.
I'm planning a visit the week after next; where's the best starting-point (the best place to park) with reference to Streetmap? I'm not desperate to see Auld Bourtreebush, just want the most accessible approach to the circle.
This one is actually on the 1:25k. That's the only way I found it. There's very little outcropping rock around so the fact that the slab is within a little kerbed cairn more-or-less puts its stature as a capstone beyond doubt, I'd say?