So far this year the two best (it's soooo boring to have to pick one) are:
Bryn Cader Faner in the snow with Postie, what a brilliant site and so worth the hard walk to get there.
The little burial chamber in the sandunes at Penmaen, Gower. A little, collapsed chamber, half covered in sand, unassuming but beautfully hidden away, full of pink and white quartz. Lovely. We've been twice now, I liked it so much.