Staircase between the first and second-floor corridors

"They marched Lockhart out of his office and down the nearest stairs, along the dark corridor where the messages shone on the wall, to the door of Moaning Myrtle's bathroom."

- Narrative

The first-floor corridor and the second-floor corridor are connected by a staircase, with the office reserved for the Defence Against the Dark Arts teacher located not far from the top.

Appearances

 * Harry Potter and the Chamber of Secrets
 * Harry Potter and the Prisoner of Azkaban