His political ideas are from 'the Stone Age'. [=are from the distant past; are very out of date]
Their lawyer said that he would 'leave no stone unturned' in trying to find more evidence.
The researchers 'left no stone unturned' in their search for the original documents.
(..) you may be King. I hope so with all my heart. And yet, I know its burdens. They're very real, like forever dragging a stone up a hill, only to watch it perpetually roll back down again. You need to drink more wine. I don't want any more, Grandfather. (..)2017 TvShow: Vikings Title: The Great Army Season: 4 Episode 17