`gryffindor tower,

Gryffindor Tower is located behind the portrait of the Fat Lady on the Seventh Floor of Hogwarts Castle. A password is required to enter it, which is spoken to the portrait. 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.