This is interesting. IBM and the Chinese Palace Museum have created a Second Life sim as a 3D advertisement for another virtual world, "Beyond Space and Time," a faithful recreation of the Forbidden City in China. I did a mini-review of Beyond Space and Time about a year ago here.
I would imagine that it was fairly easy to create a Second Life version of their custom-made virtual world, since they already had a lot of the 3D assets and multimedia created. The Second Life version is limited to the main plaza you begin in at the full-blown virtual world, with a few videos and text showing what you will find in Beyond Space and Time. Still, it's quite beautiful to walk around in.
Check out the Second Life sim here and the full virtual world at BeyondSpaceandTime.org.
