Forget Italy’s most famous active volcano, Mt. Vesuvius, which destroyed Pompei in 79 AD.
The most dangerous volcanic threat in Italy right now is one you’ve probably never heard of: Campi Flegrei, or the Phlegraean Fields.
This unassuming plain, which stretches 200 kilometers (125 miles) under the bay of Naples and the islands of Capri and Ischia to the outskirts of the city of Naples, is a giant caldera, or depression, left by a supervolcano some 2 million years ago
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