web 3D models

The first that I know was Google Earth. Then there is Google Body Browser, unfortunately it's no longer running. But there are other cool sites too, have a look at 

http://www.biodigitalhuman.com/ - take time to load the first time, but it's worth it!

http://www.healthline.com/human-body-maps 

Best news is, both human anatomy 3D visualizers do not require installation, thy run completely in our browser!