I feel that, if I live long enough, the stones will turn out to have come from Antarctica, or a passing asteroid or something
Seeking a Scottish source: Updating the story of Stonehenge’s Altar Stone In CA 415, we reported on new scientific analysis suggesting that the origins of the Stonehenge Altar Stone lay hundreds of miles from Salisbury Plain, in the Orcadian Basin of north-east Scotland.
The Past - Seeking a Scottish source: Updating the story of Stonehenge’s Altar Stone