A park by Keflavik Harbor my first night in Iceland.
As we were driving into the countryside, the tour guide pointed this out as a dormant volcano. I thought, how dormant can it be if it's steaming like that?
But then you start to notice that there are steam vents all over the place. Some small and isolated...
Some larger, with generating plants built up around them. Iceland has become a leader in utilizing geothermal energy, even exporting it in the form of smelted aluminum. (It takes so much energy to smelt aluminum that it is shipped to Iceland in its raw form, smelted, and then shipped back.)
They also use the geothermal to heat greenhouses (and presumably light them in winter), which enables them to grow about 25% of their vegetables.
A view of a southern fjord, with the rolling ridges left from different lava flows. The geology here is very new, with the land built up from volcanos in relatively recent times.