Swivelling staircase

"You can't come down here! No, sorry, you're going to have to go round by the swivelling staircase, someone's let off Garrotting Gas just along here —"

- Ginny Weasley creating a diversion to allow Harry Potter, Ronald Weasley and Hermione Granger to enter Dolores Umbridge's office.

The Swivelling Staircase was presumably a set of moving stairs, just like the Grand Staircase. It is located somewhere in Hogwarts Castle.

Appearances

 * Harry Potter and the Order of the Phoenix