Dulle Griet in Ghent

You're standing on the Groot Kanonplein in Ghent, just off the Friday Market square. In front of you lies an iron giant: the Dulle Griet, or Mad Meg. It's a bombard, a medieval siege gun built to batter city walls. And what a gun. It's over five metres long and weighs more than twelve thousand kilos. It used to be even heavier, but centuries of rust have nibbled away at it.