The entrance to the Gryffindor Tower is the Portrait of the Fat Lady. If you tell her the correct password, the Portrait will swing open to reveal the Common Room. There are two staircases opening off the common room into the Tower itself: the boys’ staircase, on which the seven boys’ dormitories are located (one for each year) and the girls’ staircase, on which the seven girls’ dormitories are located (one for each year). The girls’ staircase is under a spell so that if a boy sets foot on it and persists for a few steps, a wailing klaxon goes off and the staircase temporarily Transfigures itself into a stone slide, sending him and anyone else on the stairs sailing to the bottom. According to Hogwarts: A History, the founders believed that girls were more trustworthy than boys, so that while the girls’ staircase is enchanted to prevent boys from getting in, the boys’ staircase does not carry a reciprocal enchantment (OP17). Each dormitory is a round room with windows looking out onto the grounds, and containing four-poster beds.
Astronomy Tower Dungeons and other subterranean chambers Gryffindor Tower Hogwarts corridors Hogwarts fifth floor Hogwarts first floor Hogwarts fourth floor
Hogwarts ground floor Hogwarts grounds Hogwarts second floor Hogwarts seventh floor Hogwarts sixth floor Hogwarts third floor Madam Hooch’s office
The Dementor Flight of the Fat Lady The Marauder's Map The Firebolt The Patronus Gryffindor versus Ravenclaw Snape's Grudge Mudbloods and Murmurs The Deathday Party The Duelling Club The Polyjuice Potion The Very Secret Diary Cornelius Fudge The Chamber of Secrets The Woes of Mrs. Weasley The Sorting Hat's New Song Professor Umbridge Detention With Dolores Percy and Padfoot The Hogwarts High Inquisitor
Educational Decree Number Twenty-Four The Sorting Hat Dumbledore's Army The Triwizard Tournament The Lion and the Serpent Beauxbatons and Durmstrang The Midnight Duel The Half-Blood Prince Hallowe'en Hagrid's Tale The Eye of the Snake St. Mungo's Hospital for Magical Maladies and Injuries Occlumency Seen and Unforeseen The Centaur and the Sneak Snape's Worst Memory Career Advice Quidditch Silver and Opals Felix Felicis
The Unbreakable Vow A Sluggish Memory O.W.L.s Elf Tails Lord Voldemort's Request After the Burial Horcruxes Sectumsempra The Seer Overheard The Ghoul in Pyjamas Nicolas Flamel The Forbidden Forest The Yule Ball The Egg and the Eye The Madness of Mr. Crouch The Dream The Battle of Hogwarts The Flaw in the Plan The Beginning