help with environments, game maps and scenes

[hancock]

Hi, I'm new to reverse engine but i'm really interested to understand how it works.
I've seen the great job you made with character models and animations.
I'm trying to design a demo of my first game (really hard task).
I need to know how big companies organize level maps and environments.
My stupid question is Can I extract game content like scenes, entire levels, and open them in Unreal Engine to get info about them? or something like this.

it's possible to see even the code?

thanks so much.

[chrrox]

open source AAA game engine
https://github.com/grayj/Jedi-Academy
also ID has released tons of info on their games