Oh, yes... if it's megalithic oddities you want, Dartmoor's yer area, alreet!
As mentioned by the lovely Hob above, <a href="http://www.themodernantiquarian.com/site/1299">Yellowmead</a> is an absolute delight... The scenery is fantastic - quite vertiginous in places! The hills just seem to drop from under you, and the setting of the actual stones is so peaceful, I just found myself standing stock still, enjoying the peace, for about 10 minutes before taking any photos...
<a href="http://www.themodernantiquarian.com/site/18">Merrivale</a> has to be among my favourite places ever... Being as it is so close to, but not visible from the road, it is like being in another world... There's all manner of bits 'n' bobs here - stone rows, circles, monoliths, cists, cows... it's amazing and I love it. But as they are the only 2 places I've been to on Dartmoor, I can be of no further assistance!
There was a nice bit near Yellowmead, a way up the path, marked on the OS Explorer map at approx SX611679 - marked as a cist, but there s the remains of a settlement as well, the likes of which I've not seen before... I have some photos which I will put up some day soon.
Sorry for not adding much here... if it's Cornwall you're after, that's another story! ;o)
Take care
G x