Where are good 3D educational resources on the web?

Question

I would like a 3D image that I can zoom in and out and be able to see structure within structure and the structures have labels to permit better learning. Similar to Google earth, but objects in every day life like trees, cars, humans, computers, etc. Free would be preferable.

Answer 1

ActiveWorlds
http://www.activeworlds.com/
DesignWorkshop lite
http://www.artifice.com/free/dw_lite.html