Mark 13:2
Do you see all these great buildings? replied Jesus. Not one stone here will be left on another; every one will be thrown down — the prediction is absolute and specific: not one stone upon another. The fulfillment in 70 CE was almost exactly as predicted — the Romans dismantled the temple structures after the fire. The prophecy's precision, confirmed by history, is one of the most significant data points in the discussion of the Gospels' composition. The disciples' wonder becomes the occasion for the most important teaching in Mark about the relationship between the present age and the age to come.