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 [=are from the distant past; are very out of date]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.
(..) Honey, get back in the car. We're going to be late. Chihiro. Oh, for heaven's sake. This building's not old. It's fake. These stones are just made of plaster. - The wind's pulling us in. - What is it? Come on. Let's go in. I want to see what's on the other side. I'm not going. (..)2001 Spirited Away
(..) I must have missed the turn-off. This road should get us there. Honey, don't take a short cut. You always get us lost. Trust me. It's gonna work. What are those stones? They look like little houses. They're shrines. Some people think little spirits live there. - Dad, I think we're lost. (..)2001 Spirited Away