In ST:TNG, we actually don't get to see most of the Enterprise-D. Specifically a lot of Deck 1 is unexplored, and more specifically, Deck 1-Lower. Here are some blueprints of it.
I was wondering if there has ever been some official, or even fan-initiated, visualization of Deck 1 Lower; and failing that - some textual description (more than a single sentence) of what's it used for.