"One thing was certain: of all the teachers' offices Harry had visited so far this year, Dumbledore's was by far the most interesting... It was a large and beautiful circular room, full of funny little noises. A number of curious silver instruments stood on spindle-legged tables, whirring and emitting little puffs of smoke. The walls were covered with portraits of old headmasters and headmistresses, all of whom were snoozing gently in their frames. There was also an enormous, claw-footed desk, and, sitting on a shelf behind it, a shabby, tainted wizard's hat — the Sorting Hat." - J.K. Rowling

The Headmaster's office is the office in Hogwarts Castle in which the current headmasters or headmistresses of Hogwarts School of Witchcraft and Wizardry work during the school year. It is located in the Headmaster's Tower, accessed through Gargoyle Corridor. Although this is never mentioned, it is entirely likely that the residence of the headmaster is adjacent to the office. It is reached by means of a circular, moving stone staircase, which in turn is concealed by a gargoyle on the third floor. The gargoyle will step aside in response to a password, though the headmaster is capable of overriding the password if, for any reason, he or she desires that it will not work.

"Once you’ve arrived inside Gryffindor Tower, come inside and be welcomed by the roaring fire, stuffed armchairs, and the great view we have from our windows. Our dormitories are reached by climbing the winding mahogany staircase, decorated with crimson and gold. As I said, there's plenty of gold around the tower. Our four-posters are covered with thick scarlet blankets (we have quite windy nights up in the towers) and are embroidered with gold. Gold chandeliers cast warm glows all around." - J.K. Rowling

The entrance to the Gryffindor common room is concealed under the portrait of the Fat Lady, on the lavish Gryffindor Landing.

The common room is a circular room where Gryffindor students can relax after a long day of studying. It is full of squashy armchairs, tables, and a bulletin board where school notices, ads, lost posters, etc. can be posted. The common room is decorated in several shades of red, which is associated with the house.

There are many windows that look out onto the grounds of the school, and a large fireplace dominates one wall. The mantle of the fireplace is adorned with a portrait of a lion. The fireplace is also connected to the Floo Network, but as it is extremely public except in the dead of night.The walls are decorated with scarlet tapestries that depict witches and wizards, but also various animals. There are also bookcases located in the room, filled with various novels.

"Our emblem is the eagle, which soars where others cannot climb; our house colours are blue and bronze, and our common room is found at the top of Ravenclaw Tower, behind a door with an enchanted knocker. The arched windows set into the walls of our circular common room look down at the school grounds: the lake, the Forbidden Forest, the Quidditch pitch and the Herbology gardens. No other house in the school has such stunning views." - J.K. Rowling

Ravenclaw Tower serves as the common room for students in Ravenclaw House at Hogwarts School of Witchcraft and Wizardry. In general, it sports several shades of blue with bronze (all associated with the house). It is also the airiest of the four common rooms.

Ravenclaw Tower is one of the three tallest towers of Hogwarts Castle

The entrance to the common room is located on the west side of Hogwarts at the top of a spiral staircase, presumably located on the fifth floor, and is a door without a doorknob or keyhole, but a bronze knocker in the shape of an eagle. In order to enter the room, a person must answer a riddle asked by the eagle knocker; if they answer incorrectly, they must wait for someone else who gets it right.

The common room is a wide, circular room with arched windows hung with blue and bronze silks and a midnight blue carpet covered in stars, which is reflected onto the domed ceiling. The room is furnished with tables, chairs, and bookcases; and by the door leading up to the dormitories stands a tall statue of Rowena Ravenclaw made of white marble. According to Prefect Robert Hilliard, the sound of wind whistling around the windows of the tower is relaxing while going to sleep.

During the day, Ravenclaw students have an excellent view of the school grounds, including the lake, Forbidden Forest, Quidditch pitch, Herbology gardens and the surrounding mountains.

The Clock Tower is one of the older features of Hogwarts Castle. Within the tower, lies the mechanism that run the antique clock. There is an old courtyard at its base, and at the top is the clear glass dial of the clock. There is space between the clock's movement and the dial for a person to either repair the clock or to stand and look out over the courtyard. There are five bells in the clock tower of various sizes; these bells appear to be made of copper as the bells are rather oxidised. The Clock Tower chimes every half hour and strikes a small bell at the beginning and conclusion of class sessions. What powers the clock's mechanism is currently unknown, but it is presumed to be weight-driven.

The Astronomy Tower is the tallest tower at Hogwarts Castle. It is where students study the stars and planets through their telescopes in Astronomy lessons. This is usually done at midnight, when the stars are best seen. The tower is generally out-of-bounds except for classes.