The entrance to the headmaster's (or headmistress', depending on the era in question) office at Hogwarts is behind a statue of a gargoyle (see). When given the proper password, the gargoyle will leap aside, and the wall behind it will split in two to reveal a spiral stone staircase that moves like an escalator 1. Dumbledore's password (see) for the gargoyle always seems to have been the name of a sweet, and to have been known to the various staff members though not to the student body at large. However, the office can be sealed so that none can enter save the rightful Headmaster or Headmistress, and also can be sealed so that someone already inside cannot leave without the Head's permission. Once in the door, visitors ride on a spiral stone staircase that moves slowly upward as the gargoyle's entrance closes behind them. The staircase leads to a highly polished oak door with a brass knocker in the shape of a griffin. The door is not sound-proof; a visitor standing on the staircase can hear anyone speaking in the room inside, although not necessarily distinctly unless the speakers' voices are raised.
he walls of the office are covered with portraits of previous Headmasters and Headmistresses (see). The wall immediately behind the Headmaster's desk has a shelf holding the Sorting Hat. Gryffindor's sword is kept in a glass case beside the Sorting Hat. Another wall of the office holds a fireplace that can be connected to the Floo Network when needed.

The Headmaster's desk is an enormous, claw-footed affair that apparently goes with the room, since it was in use in Armando Dippet's day. The surface is highly polished, though naturally it is sometimes covered with papers. Dumbledore also kept a silver ink pot with a handsome scarlet quill (possibly a phoenix feather) on the desk. The desk faces the door leading up from the gargoyle; a visitor standing with his back to the Headmaster's chair (which is particularly high-backed) will find himself or herself staring out at the Quidditch pitch. The Headmaster kee

Where they had Astronomy class every Wednesday night at midnight. Handy for meeting with broomstick riders in the dead of night - except when it requires hauling a heavy crate up the three flights of stairs from the Entrance Hall to the corridor beneath the tower. The top of this tower where observation sessions are held for Astronomy is more or less directly above the front entrance of the castle; the top of the tower has a parapet. A steep spiral staircase leads to the top of the tower with a door (which has an iron ring as a handle) leading out onto the ramparts, which are crenellated. To get from the foot of the Astronomy Tower's staircase to the staircase leading to the entrance hall, one must pass through two corridors before rounding the corner to see the staircase leading (eventually) to the Entrance Hall.

Trelawney's residence and the Divination classroom.