Stonehenge was always something I wanted to see. There is nothing in the area except for the structure so while being shoehorned between Windsor Castle and Bath sounds like giving it less respect than it is due, the about 90 minutes there was more than enough.
People are not allowed to go into the immediate area of the rocks, still it was an amazing sight. Some of the photos showed close-ups on how they managed to fix the rocks so that they would be stable.
Here is a link to more information on Stonehenge.