US sailors that have visited Naples may have toured this site. Just like Yellowstone NP, heed the warnings or Darwin will take over.

Three members of an Italian family died visiting a volcanic field Tuesday after an 11-year-old boy entered an off-limits area.The boy slipped after breaching a fence surrounding the Solfatara Crater in Pozzuoli and his parents followed in an attempt to rescue their son, police said.
The boy’s father, 45, died by falling into a pit of boiling-hot mud, the Campania Civil Protection Department said, ANSA reported.
The boy’s 42-year-old mother was also sucked in.
what a way to go