pozzuoli, the super active volcano of the campi flegrei. the solfatara is the only visible mouth with its fumaroles

coast ruins sea rock terrain river geology waterway wall cliff water fortification shore landscape vacation transport tourism bridge fumarole sulfuric mineral vapor hot bradyism active mystery heat clouds mountains crater fog hydrothermal solfatara pozzuoli thermal volcanic phenomena fumaroles solfatara super volcano valley eruption campi flegrei rock ecosystem caldera national park wildlife nature volcanic geyser hiking steam geothermal mountain tourism outdoor water sky italy naples sulfur beautiful bison orange barren palpitation