"The Gryffindor Tower is located behind the portrait of the Fat Lady on the Seventh Floor of Hogwarts Castle.A circular hole is behind the painting, leading to the common room, which is a circular room where Gryffindor students can relax after a long day of studying. The common room is full of squashy armchairs, tables, and a bulletin board where school notices, ads, lost posters, etc. can be posted. A window looks out onto the grounds of the school, and a large fireplace dominates one wall. The common room is decorated with scarlet tapestries, which hang on the walls. It is usually where celebration parties are held after Gryffindor Quidditch victories."
The Board of Requirement