What happens to the remains of the ancient empires when Christ returns?
When Christ returns, the remains of the ancient empires will suddenly be rolled under the pictured stone, which is Christ at His Second Coming. He will literally blow them all away like chaff from a threshing floor, and a 75-day period will cleanse the planet of everything that has remained.
Les explains that Greek architecture and philosophy and Roman courts, judges, law, and republican government are among the remains of ancient empires. At the Second Coming, those remains are pictured as suddenly rolled under the stone—Christ—and He will literally blow it all away. Using the harvest and threshing-floor image, Les notes that wind separates grain from chaff and blows chaff away; likewise the great empires and all that remains of them will blow away like chaff. He connects this to Daniel being told to wait 75 days, a period that will cleanse the planet of everything that has remained.