[@$3.1415rin]

http://learn.arc.nasa.gov/worldwind/



because the servers are of course a bit crowded, there are several cache files :

The Alps:
http://learn.arc.nasa.gov/worldwind/cache/18-alps.zip (195 MB)

Yosemite National Park:
http://learn.arc.nasa.gov/worldwind/cache/08-yosemite.zip (96 MB)

Some parts of Europe and Germany with medium accuracy:
http://www.twobeds.com/nasa/Mostly_Europe.zip (100 MB)


some more links:
http://learn.arc.nasa.gov/worldwind/forums/index.php?showtopic=227
http://learn.arc.nasa.gov/worldwind/cache.html