Oh, my mistake, I had seen them. Besides the antiquarian guesswork, a good many of the megalithic sites were used as ready sources of building stone, right up to modern times. During one restoration of a large, apparently lone standing stone in the 20th century, the remains of a 15th c (if memory serves) victim of a stone-tipping were found. Apparently the site was being used as a quarry by the local gentry, and one guy, perhaps the bossman, was standing a little too close.
In the early 17th century, architect Inigo Jones drew what he thought was a likely original design for Stonehenge, and I’d wondered if he drew his conclusions on a larger number of surviving stones during his era. He was incorrect about it having been built in Roman times. However, even post holes leave their traces, so if there had been more really large stones stuck in holes at the site, their holes would be detectable. This means, the next major restoration will be able to correct problems with those of the past.
That was interesting!