We visited Stonehenge 10 years ago or so. Didn’t see much in the way of dirty hippies, just other tourists, mainly complaining that they were cold.
It’s sort of a strange juxtaposition with the A303 just a stones throw away.
Also jets landing at Boscombe Down.
The only time I came near it was driving along after midnight on that A303 in the late 60’s going to Cornwall.
No fences back then and it could be easily seen from the road.
It was way to creepy to stop and go for a visit...:^)