At what's dubbed "the world's only drive-in volcano" (which isn't exactly true, I also know of another called Irazú, in Costa Rica), the rotten-eggs-smelling water bubbles out of the ground 220⁰ Fahrenheit. Besides having a look, nearby there's a facility where you can have a hot mud bath (which besides being fun are said to have "medicinal qualities") and rinse off under a 50-foot-high waterfall.

Gordon Leggett