Grand Staircase

The Grand Staircase is a massive structure in Hogwarts Castle, mainly used to access each floor of the castle, including the dungeons. There are hundreds of Portraits covering the walls in this tower, some of which conceal secret passages to other areas within the school. The multiple staircases in the Grand Staircase like to move around, from platform to platform. The stairs go as high as the seventh floor where they come to an end.

It was Rowena Ravenclaw who came up with the idea of using moving stairs.

Behind the scenes

 * The Fat Lady's portrait is on the seventh floor landing in the later films making it entirely visible to passers DH2_Ginny_Weasley_and_other_Hogwarts_students_running_at_the_Staircase.jpg and Neville running at the Grand Staircase in 1998.]]by; however, in the first film, her portrait is shown in a corridor somewhere else in the Castle.
 * Although in the film the stairs are shown to be constantly moving, there is no mention of this in any of the novels.
 * When Dolores Umbridge takes over the school in the film version of Harry Potter and the Order of the Phoenix she has Argus Filch take down all the portraits from the Grand Staircase. She also puts speakers constantly reciting her Educational Decrees on each floor. When Albus Dumbledore is restored to Hogwarts, the portraits are restored as well.
 * In the film version of Harry Potter and the Philosopher's Stone, it shows Prefects leading Ravenclaw students to their Common room, where they walk down the stairs from the Entrance Hall, which leads to the Dungeons where the Slytherin Dungeon is.
 * Although this structure is referred to as the "Marble Staircase" on The Wizarding World of Harry Potter (see this image), on the books the Marble Staircase is a flight of stairs connecting the Entrance Hall with the first floor.
 * In Harry Potter and the Deathly Hallows: Part 2, they have been changed. They are wider and seem not to move.

Appearances

 * Harry Potter and the Philosopher's Stone (film)
 * Harry Potter and the Philosopher's Stone (video game)
 * Harry Potter and the Chamber of Secrets (film)
 * Harry Potter and the Chamber of Secrets (video game)
 * Harry Potter and the Prisoner of Azkaban (film)
 * Harry Potter and the Prisoner of Azkaban (video game)
 * Harry Potter and the Goblet of Fire (film)
 * Harry Potter and the Order of the Phoenix (film)
 * Harry Potter and the Order of the Phoenix (video game)
 * Harry Potter and the Half-Blood Prince (video game)
 * Harry Potter and the Deathly Hallows: Part 2
 * Lego Harry Potter: Years 1-4