If there's a site where there is more made to do about less, I'm not aware of it. I don't mean to talk Stonehenge down, and they have a really nicely maintained site (now that they've moved the highway out of the actual site) but it's just weird seeing it from the highway, and there's just so little to actually see.
The most important thing I learned was that our conception of the site as a once-complete circle with identically sized and finished monoliths is probably wrong. The "back" of the circle has smaller stones and there's strong evidence it was never actually finished.