Google's already taken you across the globe, down to the bottom of the oceans, and out to the mountains of Mars. It's been a vaguely educational journey! Their next frontier: the human body, with Google Body Browser.
The Body Browser, which I first read about on the lovely site The Hairpin, is an explorable 3D model of human anatomy, from the skeleton and muscles to the circulatory and nervous systems. It's currently in Google Labs and requires a web browser with WebGL support for perusal (Chrome beta, Firefox 4.0b1). They might wanna change that name, though. Body browsing sounds kinda creepy. [The Hairpin via Body Browser]