If you think Mount Vesuvius is scary, wait until you hear about Campi Flegrei! This supervolcano has 24 underground craters and makes Vesuvius look small in comparison. The crazy part? Half a million people live right in the danger zone today! Even though it hasn't erupted in 500 years, scientists have noticed it's getting more active lately. With over 1,000 small tremors happening each month, people are starting to pay attention. If Campi Flegrei blows, it could be a major disaster!

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