Alternatively of course the millions of theories may be ALL wrong! We need an infinite number, to be sure about it.
I'd qualify this:
"the only real facts that we know about Stonehenge FOR CERTAIN , is that it is indeed ancient, and that it is here in the land of our birth"
and add "... at present, anyway".
Possibly 2 nicked circles possibly built by visiting foreigners.
More than marbles may be resting on the decision about the Elgin marbles.