This article covers a subject that has been deemed non-canon by either the author or the Harry Potter licensees, and thus should not be taken as a part of the "real" Harry Potter universe.
"Are you a wizard or not?"
The title of this article is conjectural. Although it is based on canonical information, the actual name is conjecture and may be supplanted at any time by additional information released from canonical sources. If this occurs, please move this page to the appropriate title.
The Great Hall staircase is a spiral staircase located through a door behind the staff table in the Great Hall. It leads down to the Trophy Room. It is somewhat of an entrance to the castle ("Alastor Moody" walks into the Great Hall through here after being outside).