Pozzuoli (Italy): Tourists approaching a sulfuric fumarole vent in the Solfatara crater. Though the Solfatara is part of a still active volcanic system, with a large magmatic chamber underneath, it is possible to visit it and walk on the hot ground. Like Lake Avernus, it is a crater of the large Phlegraean Fields volcanic caldera. (Photo by Piero Castellano)
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