Pozzuoli, Cuma, and Solfatara
"This is the stuff of legends. See the site of the Cumaean Sybil, who
was granted eternal life by a god who was infatuated by her. Visit one of
the largest and most important amphitheaters in Italy dating from the times of
Vespasian. Visit the extinct volcano of Solfatara, that still puts on a
show with jets of steam charged with sulfurous fumes and miniature volcanoes
that spit hot mud. You will understand why Dante called this place "the
Gate of Hell."" -- ITT Brochure