The “baseball size hailstones” fell from thunderstorms at a speed of “at least 75 miles per hour,” according to Jonathan Erdman, a senior meteorologist for the Weather Channel.
“It’s no wonder you can see the magnitude of smashed windshields and structural damage,” he added.
Video footage shows the gigantic hailstones pummeling a car windshield, shattering the glass.
Another shows the ice balls crashing into the sea alongside a boat, as shocked passengers watch them hit the water.
The hail can also be seen hammering the pavement, making a crashing sound with each hit.
The storm was caused by a southward plunge of the jet stream that carved into western Europe, sending an upper disturbance into the Italian peninsula on Saturday, according to Erdman.
That instability stirred up a thunderstorm over the Mediterranean, which swept into Italy and caused the hailstones.
While the hailstones were certainly impressive, they weren’t Europe’s most destructive. Germany holds that record, with a hailstorm that caused an estimated US$2 billion in damages in 1984.