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 lead from platform to platform and go as high as the seventh floor where they come to an end. The stairs also have a knack for moving around the staircase chamber, usually when a student is walking up one of them.
It was Rowena Ravenclaw who came up with the idea of using moving stairs.
The Fat Lady's portrait is on the seventh floor landing in the later films making it entirely visible to passers by; however, in the first film, her portrait is shown in a corridor somewhere else in the Castle.
In the third movie, it's shown that Grand Staircase travel upward to more than ten stories.
In the first two films the stairs are shown to have door to corridor at every landing. But in the next movies, one floor is equal to two floors in the first two films
In the first five films the stairs are shown to be constantly moving, something which is never mentioned in the novels. When the stairs are seen again in Harry Potter and the Deathly Hallows: Part 2, it has a different appearance with grandeur marble stairs and the stairs no longer move. Upon leaving the Entrance Hall the wider middle staircases travel upward while the staircases to the side travel downward. However, they could have stopped moving for the battle. Also the staircase could have moved to match Snape's running of the castle giving students enough room to move in large collective groups up and down the stairs without stopping.File:Hogwart Grand Staircase.jpg
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 LEGO Harry Potter: Years 1-4, the staircases are controlled by a portrait, who changes the levels the staircases lead to.
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