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.

The Great Hall in Hogwarts Castle is the main gathering area in the school located off the Entrance Hall. Students eat their meals, receive daily owl post, and have certain special events here. The Great Hall is a large hall that can easily hold all of the school's students, staff, and guests, with tall walls that reach up to the ceiling. The ceiling itself is covered with candles and enchanted to look like the sky above. At the front of the hall, is the staff table, which is designed to house the entire Hogwarts staff, with a throne-like chair in the center of the table where the current Headmaster or Headmistress sits.

The Middle Courtyard is one of the cloisters in the inner part of Hogwarts Castle. This courtyard has grass in the open area, in which a big tree has grown over the centuries. There is one massive iron Armillary Sphere that stands in the centre of the courtyard.