You can easily purchase or download data and begin exploring other worlds.  Here's what I've tested GeoVirgil with:
 

Planet	Probe	Dataset Name	Type of Data	Purchase	Download
Venus	Magellan	F-MIDR	radar imagery	link  (info)	link
Venus	Magellan	C-MIDR	radar imagery		link (lower res)
Earth's Moon	Clementine	UVVIS	imagery	link	link
Mars	Viking 1 and 2		imagery	link	link
Mars	Global Surveyor	MOC	imagery	link	link
Mars	Golbal Surveyor	MOLA	elevation	link	link
Neptune	Voyager	camera	imagery	link	link

    PDS data files generally end in ".img".  GeoVirgil reads imagery data and elevation image data written using PDS version 2 or 3.  For data files that don't contain a latitude or longitude (e.g., Mars Global Surveyor MOC images), you will be prompted for a latitude and longitude.  GeoVirgil may read other PDS data that isn't in this table.  If there is data you want to look at and GeoVirgil doesn't load it, just let me know and I'll see what I can do.