Located on the third floor of the Castle is the Library, where tens of thousands of books rest on thousands of shelves. There are many different sections among the library, including the Restricted Section, which requires a note from a teacher to visit. There are various spells on the books to prevent students from ruining and stealing them. Food is forbidden in the library.

Located on the second floor is the Hospital wing, where students and staff are treated for any injuries or curses they may suffer throughout the year. Only six visitors are allowed at a time for each patient. It's well equipped for many magical and mundane injuries, from broken bones to regrowing bones. The Hospital Wing is able to deal with many different situations, as such, it's a rare occasion a patient is sent to St Mungo's for further treatment.

There are four common rooms located throughout the school, one for each house. A common room is a lounge area shared by the house within the school. Common rooms each have a fireplace and sitting areas. Because the different houses have different colors and personalities, each common room is decorated to represent their house. The four common rooms also have two dormitories, one for the men, the other for the women. Because when the school was first made, it was deemed women were more trusted than males, a female can enter the male dormitories, but a male is unable to enter the female dormitories. Each house requires a certain means of entering their dorms to prevent the other houses from entry. Hufflepuff has a tune that needs to be tapped, Ravenclaw a riddle, and Slytherin and Gryffindor a password.

Throughout the seven floors of the school, classrooms are scattered throughout. Students are required to attend their classes, and each classroom is designed differently, to accommodate the curriculum and the teacher's preference.

A large circular room with many windows and portraits of late headmasters and headmistresses, the Headmaster's office is the permanent home of the Sorting hat. Behind the Headmaster's desk is a portrait of the predecessor of the current headmaster, and this portrait is the largest in the room. The office holds number of delicate looking silver instruments that whir and emit small puffs of smoke which sit on spindly tables. There is also an incredible collection of books, a Pensieve, and Dumbledore's pet phoenix, Fawkes.

The Grand Staircase is actually multiple staircases, reaching from the dungeons to the seventh floor, where they stop. There are hundreds of portraits covering the walls in the tower the staircases are located, some of them concealing secret passages for shortcuts to other parts of the Castle. The Grand Staircase leads from platform to platform, and are prone to moving when students are walking on them.

A secret of Hogwarts, the Room of Requirement only reveals itself when someone in need walks past it three times thinking about what they need. It is thought to bear some degree of sentience, as it transforms into whatever the person using the room needs at the moment. While the room is able to produce next to everything, there are limitations, and the room is unable to provide food to those inside. It's located on the seventh floor of Hogwarts, opposite the tapestry demonstrating the attempt of Barnabas the Barmy to teach trolls ballet. The users of the room are advised to be very specific about what they are looking for, as it's been shown others are able to find the room and see what the occupants are doing if they know the room is in use. It is also in this manner the room can be used to keep certain people out, if the user specifically asks the hideout to keep certain people out.

Located at the top of the Castle's West Tower is the Owlery, home of the owls owned by students, staff, and the school during the school year. A circular stone room known to be cold and drafty because of the lack of glass in the windows, owls are able to come and go freely, but when they are there, they rest on perches rising right to the top of the tower. The floor is covered in straw, owl droppings, and regurgitated skeletons of rodents. The room is very cold in the winter, and ice is often found on the higher levels of the owlery during these months.

A small wooden cabin sits at the edge of the Forbidden Forest is the home of the gatekeeper of Hogwarts. There's only one room inside, decorated with a fireplace, bed with a patchwork quilt, and chairs. Pheasants and hams hang from the ceiling, and a copper kettle is usually found hanging over the fireplace boiling water.

The Forbidden Forest is on the borders of the school grounds, and is off limits to students, though detention is held in it. Dangerous creatures call the forest home. Among these creatures are a colony of Acromantula, herds of centaurs, unicorns, hippogriffs, and threstrals.

The Whomping Willow was planted in 1971 to disguise an entrance into the Shrieking Shack. It's a very valuable plant, but very violent too. The plant attacks anything that comes into range of its branches, and can only be calmed if a knot near its based is touched. It's a deciduous plant, and its limbs function much like arms, so any damage received to it has to be treated as such.

Located off Diagon Alley in London, Knockturn Alley is filled with shops specifically for the Dark Arts. Unusual and dangerous people are often found wandering the streets, and so the witches and wizards who enter are advised to be on guard.

Located deep underground below Whitehall in London is a very large, ten story building housing several offices, departments, and courtrooms. The Magical Maintenance Department chooses weather, which is shown outside the windows of the Ministry. Lifts access the first nine levels, while the Wizengamot Courtrooms are accessible from a set of stairs from the Department of Mysteries located on Level Nine. To visit the Ministry, wizards must enter and abandoned red telephone booth and enter '62442' and following directions from an operator, enter the Atrium on Level Eight. Employees enter via service lifts, with more than twenty stopping at the first nine floors.

Located at King's Cross Station in London between platforms Nine and Ten is Platform Nine and Three Quarters. A magical barrier keeps muggles out, and to get in, witches and wizards much walk directly at the ticket box dividing platforms Nine and Ten. A guard is posted outside the entrance, regulating entries and exits from the platform.

The ancestral home of the Black family, Twelve Grimmauld Place has recently become the Headquarters for the Order of the Phoenix. It is located in London, protected by a Fidelius Charm, Albus Dumbledore being the Secret-Keeper. The house is invisible, placing number thirteen next to number eleven. The front door leads to a long hallway, lit by a large chandelier and gas lamps. The house is filled with peeling wallpaper and worn carpet. Walburga Black's portrait hangs in the hallway. The hallway leads to the dining room and a staircase, which leads to the upper floors. On the second floor, among a bedroom and a bathroom, is the drawing room, where the Black family tree hangs.

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