There are some pretty magical ones here in Snowdonia, as you can imagine, but the one that really rocks my boat, is a single solitary boulder, of considerable size, in Cwm Eigiau.
The one i am talking about, is on the hillside below the slopes between Foel Grach and Foel Fras.
Ive visited it a few times, and its only when you get up close to it, that you realise just how big the thing is.
I am nudging 6ft in height, but this boulder towers way above me, and its the only one on the hillside, so it looks a bit out of place, but you know your walking in a glacial valley.