Eyjafjallajökull, erupting in October 2010, in Iceland. This massive volcano is the little brother of another brooding subterranean monster lurking under deep glacial ice called Bárðarbunga. Click image for larger, gorgeous version at National Geographic's website. Deep under a layer of ice and kilometers of rock and soil, an Icelandic monster may be waking from a long wintery nap: Ice caps the volcano, which complicates the efforts at prediction, says Gudmundsson.