The New Easy to Master Dungeons & Dragons was my first exposure to the D&D basic line. At the time, I was already quite into Second Edition (my gateway edition), so I’m not sure why I even had a copy of this. Maybe it was a present or something? In any case, it ended up being quite educational for someone who had never seen race-as-class or an unarmored AC of 9 before. I ultimately picked up a copy of the Rules Cyclopedia too, for the full experience.
Check out Zanzer’s Dungeon (from this site that is in a language I don’t understand). This was the map of the dungeon for the included beginning adventure. Looking at that map now, it’s a rather wacky design: basically a big spiral leading in to the prison cell where the (captured) PCs are expected to begin. Not much naturalism there. Also, I don’t remember where the actual entrance was supposed to be. Is there a staircase I am missing or something? Maybe it was the concealed door in room 33?
Not that I’m a stickler for logic or anything, but here’s a scenario idea for recasting this map so that it makes more sense. There’s obviously some mining going on here (see rooms 30, 31, and 32). Say the entrance (from the surface) is in room 28. Rooms on the right side (the mining side) are new construction. This would be everything on the right side of the corridors with rough walls. Rooms on the left side are ancient construction (a barrow reinforced with ancient spells and meant to contain an evil power). The center of the map (the “cell” that is room 1) should be recast as the demon containment unit. The rooms leading to it contain greater and greater guardians, intended to keep the ancient evil in and also to prevent evil cultists from releasing it. (Thank you, Glen Cook, for the Barrowlands inspiration.)
The new construction on the east side was started by a greedy merchant who either does not hold the old legends in high esteem, or does not care as long as he extracts the mineral wealth.
Further adventure hooks are left as an exercise for the reader.