I think Bath is lovely - very beautiful, if expensive.
I wasn't fond of Boscastle when I visited, didn't feel terribly at ease there but I don't think this was for any woo reason - just found it a strangely unappealing place.
Wookey Hole I loved as a child, fascinating and beautiful. Always felt sorry for the supposed 'witch'.
Visited Stonehenge about 3 years ago for the first time since I was young, was surprised by the experience. There was a strange sort of ethereal power to it, a sense of it being a liminal place. Probably down to it being quite awe inspiring.
Can't comment on Glastonbury as I was planning a visit last summer but you all know what put a stop to that...I hated Gloucester, the cathedral aside (which I loved) but that's cos it was a complete dive when I visited and dreadfully grim.
I think as humans, we unconsciously pick up on energy and mood from each other. Consider the energy that we can get swept up with at times of celebration. Rituals, religious, social or otherwise, use this. I think we find a sense of this 'energy' (for want of a better word) naturally stronger in some places than others and it's obviously affected to some extent by subconscious bias and preconceived expectations.
If you visit a place where overall the natural or historical features of it that generate awe are respected, you're more likely to have a positive experience than when visiting a socially deprived or overly commercialised area.