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 [=are from the distant past; are very out of date]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.
(..) Yes, we've met. A shrewd man. For my wedding he gave me three petrified dragon eggs. that the ages had turned them to stone. How many centuries has it been since dragons roamed the skies? But I dreamt that if I carried those eggs into a great fire, (..)2012 TvShow: Game of Thrones Title: The Old Gods and the New Season: 2 Episode 6