It erupted 200,000 years ago, 40,000 years ago, 35,000 years ago, 12,000 years ago, and 500 years ago. We're talking about Campi Flegrei, a volcano in the metro

It erupted 200,000 years ago, 40,000 years ago, 35,000 years ago, 12,000 years ago, and 500 years ago. We're talking about Campi Flegrei, a volcano in the metropolitan area of Naples (Italy), one of the most densely inhabited areas in the world.