Drawing a section is always one of my favorite tasks on an architectural project. (And if you must know, drawing an elevation is my least favorite.) I think it's because it satisfies my curiosity. It answers questions. It clarifies all the obscure point. It's challenging. It is something we don't see everyday.
And here is the master of section drawings, Stephen Biesty. You have probably seen many of his work on children books. If you haven't, just check out his website.
Here is his work in action, Building Tower Bridge.
Enjoy!
Source: YouTube