The Slumped Wall
The southern wall has bellied inward over the years without ever quite failing, and someone has propped it with three timbers that are now doing real work. They creak when you cross the room. The props are notched at the top in a way that suggests the person who cut them knew exactly what they were doing.
Depth 2
You are reading the dungeon, not walking it. Rooms are only created by people, and only from inside the maze.