Antarctica Ice Cave
For many people, the word "Antarctica" evokes images of endless sheets of ice. But it turns out that the southern continent has a wealth of varied and spectacular features to offer. Antarctica's Mount Erebus is a bit of an odd duck in the world of volcanoes. While virtually all others have a solid cap of rock covering their magma pools, Erebus' has none—just a mile deep lake of roiling, liquid hot magma.