stonehenge used to be free & you could sit on the stones. there is a pic of me sitting on the stones aged about 4.
you're right, now they don't let you go near them & charge you money just to look
there are some stones nearby ( rollright stones) I think are free, and you can walk around & sit on them.
It's terrible that people can charge money for things that are the property of the nation. Next time you're in London, check out a museum or two - all free & more interesting!