The main characters (Hemo and Globina) were travelling inside the body and assisting to the amazing processes that keep us alive, the fights against diseases, the way vaccines work and so on...
My sister was even collecting the books: the first one came with a transparent shell of a human body and at each release you were getting one more organ/body part. Kind of creepy, but great educational fun!
The CORPUS is Leiden seems to offer a very similar experience, albeit in 5D and on a massive scale (it's 35 meters tall).
As they say on their flyer "you enter at the knee and get out in the brain" and in between you see and explore, using all your senses, the organs and vital functions of the amazing human body.