GeoEye is a company that owns Earth-imaging satellites and provides imagery for commercial and government clients. They have a set of image galleries with imagery of natural and manmade features. Here are a couple images from their volcanoes gallery:

Krakatoa, Indonesia:

Nyiragongo, Congo:

If you’ve used Google Earth, you’ve probably seen GeoEye imagery, as Google has exclusive commercial rights to GeoEye-1 satellite imagery.

Cool stuff.

Grace and Peace