I've had a few sightings but never any at megalithic sites. I think that if you spend a lot of time outdoors you're going to see 'stuff' at some point. I do wonder if locations are incidental. If you spend a lot of time at ancient sites it raises the probability that that's where you'll see them.... if you see what I mean. Mine have been mostly over the sea and in the mountains... where I spend most of my time