Yellowstone Supervolcano

A terrain map of the Yellowstone Caldera (aka Supervolcano).

This thing was created with OmNomNom Creator:
http://www.thingiverse.com/thing:24639

More information on the Yellowstone Caldera:
http://en.wikipedia.org/wiki/Yellowstone_Caldera

Images of pretty much anywhere on earth can be made into a 3D object with OmNomNom, and elevation maps taken by the Shuttle and obtained from the USGS:
http://earthexplorer.usgs.gov/