In Cornwall on Bodmin Moor, which is a fairly small moor compared to some and not lovely compared to some, but beautiful to me and forever evocative of home, is Chun Castle. At least, the ruins of it - long gone and the sort of place school children scramble over the moor to visit. Further away from the Castle is Chun Quoit. There are lots of them round our way in Cornwall and Devon. They were burial mounds but made out of slabs of granite. Usually a hole would be dug (not overlarge) and the body would be inserted in the hole, and the slabs stacked over it. They are not consistent in shape but have consistent features. Chun Quoit is, as you say, a very visual reference. Bodmin Moor has been my favourite place for a long long time. I remember my poor husband almost carrying me up there when I spent a long period with very limited mobility - and he dug soil from there for me to put in my geomancy box (carefully replacing the rough grasses).
There is a ring of standing stones there made of solid quartz and it sings in your head.
And the Hurlers - a large group of stone circles - only small stones, but up there at the Hurlers at the right times, crystals and coins are still dropped in the right pool, and candles burned.