The Astronomy tower is a large tower at the end of the seventh floor of Hogwarts castle. The students take classes at night here, and so it has a large opening onto the night's sky, and a very accessable roof. There is also a classroom separate from the open-air tower.

Only students put into this house may enter and the entrance is in polished wall with a broze eagle knocker who decides who gets in and out with tricky riddles.

The common room also used to be up in the towers, but as they were mostly destroyed in the great battle.

The Headteachers office is hidden behind a large gargoyle who will defend it, as long as the entrant doesn't have the password. The students then have to climb up a steep, winding stairway until they come to a dark wooden door.
The actual office itself is a large oval shape, with two windows at the head of the room which cast light around. Portraits of past headteachers line the walls, as they all give guidance to the current headteacher in times of need. In an alcove there also lies the Sorting Hat and the Sword of Godric Gryffindor, both important reminders of the events of old and important for the continuation of the school.
The Headteacher can usually be found here, so drop in if you have any worries.

Also known as the 'Come and Go Room' the Room of Requirement is practically essential to the survival of misbehaving students who need to hide, and those who are just in need. It is situated on the Seventh Floor, opposite the tapestry of the dancing trolls but can only be found by whoever is seeking it. It can be unplottable should the occupant wish it to be, and when someone is inside, no one else can enter without their permission. This is where the DA practices are held, among other illicit activities.