I’ve always had this idea that at the very top of Gryffindor tower, past all the dormitories, there is a wall, but if you tap it with your wand 3 times it becomes like the platform 9 3/4 wall and you can walk through it. There is a door on the right (coming from the girls set of stairs) and a short flight of stairs up to this room that’s all dusty and has a bunch of old books, some chairs, blankets, ect, ect and the reason nobody has been there in awhile is because who just tappes their wand randomly on walls? I dunno it’s just always been at the back of my mind f and if I ever got around to writing a whole fanfic book (I am indecisive okay) I would use it