Photo: MUBI The Italian city of Naples, with Mt. Vesuvius forever looming across its bay, has always existed in the shadow of apocalypse. At least that’s the mood director Gianfranco Rosi evokes in his mesmerizing documentary Pompei: Below the Clouds , which won a Special Jury Prize at the Venice Film Festival last year and is finally being released theatrically in the U.S., ahead of a March 27 streaming premiere on Mubi. The apocalypse Rosi presents is not just the legendary one that destroyed