You know how in The Time of the Angels/Flesh and Stone not all of the weeping angels look like angels? Some are crumbling statues, their features hardly visible. But all the same, they could transport their victims back in time and feed on the time energy created in the process.
What if the standing stones at Craigh na Dun, which in Outlander transport Claire back to the 18th century, are not actually standing stones? What if that is actually a circle of weeping angels, quantum locked & thus not able to look at each other, that was left to wither away through the centuries?
[ This popped into my head at work this morning & it made me laugh but there’s no one in the office who watches both series so I had no one to share this idea with… so, I’m just sharing it here ;) ]