I was slightly disappointed when I first visited Stonehenge as the standard tours keep you fairly far away and roped off.
But, I took a modestly more expensive "Inner Stones" tour a few months ago and lucked out being selected to be fully alone for a minute. It was a profound experience being in the middle of such a historic place.
Highly, highly recommended!
I highly recommend avebury, about 20 minutes down the road. Absolutely enormous megalithic complex, huge man-made hill, and you can just wander where you wish, go hug a menhir, whatever you fancy - and there’s hardly ever more than a handful of other people there. Oh and it’s free.
Best of all go during the summer solstice when there is free public access. It’s really quite fun.
During the the 1980s and ‘90s there were regular clashes between new age hippies and police stopping them from reaching Stonehenge during summer solstice before public access was allowed.