I have always loved cutaway diagrams. (I suppose I was an early enthusiast of visualizations.) As a kid, I would make drawings of both the external appearance of a machine or building as well as the occasional internal plan or profile. Cutaways like this fascinated me. The artists who created them were like magicians to me.
UPDATE: My apologies for the first version of this image not being enlargeable. You can now click on the image to embiggen it.