The Room Behind the Wall
Nobody has ever stood here. Every way in was closed, from the outside, by people who then went on and did not write down why. The floor is unmarked. The air has not moved in a long time. It is the tidiest room in the dungeon and it will stay that way.
Depth 2
You are reading the dungeon, not walking it. Rooms are only created by people, and only from inside the maze.