James Potter, Sirius Black, Remus Lupin and Peter Pettigrew (known as the Marauders) created the Marauders Map while they were students at Hogwarts. The map is a magical document which exposes every part of Hogwarts, including the secret passages, as well as the location of every person on the grounds, indicated by a dot and their name (though in the movies footsteps were used as indicators instead). The map can’t be fooled by invisibility cloaks or any kind of potion or spell, and can even detect the castle ghosts. The only flaws of the map are that it’s unable to discern the identities of people with similar names (like Barty Crouch Jr./Sr.), and it doesn’t show rooms that are unable to be plotted on a map (like the Room of Requirement).
While it’s known that Hogwarts School is somewhere in Scotland, the exact location is hidden with various charms and spells that make it impossible to discover. If anyone does come across it, all they see is the ruins of a castle with a warning to keep out.
3Room of Rewards
The Room of Rewards is a secret room at Hogwarts that records the various accomplishments of the students. The entrance is found behind the portrait of Vindictus Viridian on the Grand Staircase and is a separate room from the Trophy Room.
4Common Room’s entrance
The Hufflepuff Common Room’s entrance is located in the kitchens, concealed behind a pile of barrels in the back right corner. To enter you must tap the right barrel on the bottom row with the rhythm of Helga Hufflepuff—tap tap, tap-tap-tap. If you get it wrong, you get soaked with vinegar.
In 1926, the students of Hogwarts were sent home early due to a threat from the dark wizard Gellert Grindelwald. Steps were taken to increase security at the school, but when the Daily Prophet reported the danger, the choice was made to send them home. The School’s permanent closure was considered during both openings of the Chamber of Secrets, but it didn’t end up being shut down either time. Then again, when Dumbledore was murdered, several of the teachers felt that the school should be closed, but the Ministry of Magic’s takeover by Death Eaters forced it to remain open that year under their rule.
There are seven required subjects for all first-year students at Hogwarts. They are Transfiguration, Charms, Potions, History of Magic, Defence Against the Dark Arts, Astronomy, and Herbology. Learning how to fly on a broomstick is also required of all students.
7Professor Snape's office
Below the ground floor of Hogwarts are several dungeons. The dungeons are the location for Professor Snape’s office, which was a gloomy room with low light and was “lined with shelves of glass jars” filled with dreadful things. In one corner was a cupboard which contained Snape’s private stock of potion ingredients—a cupboard which was frequently plundered by various characters from the series.
The subjects of the portraits hung in Hogwarts are able to move around from portrait to portrait and even visit other portraits of themselves elsewhere in the world. The paintings are generally of witches and warlocks, and thanks to enchantments, can incorporate some of the subject’s favorite phrases and behaviors.
In addition to the numerous ghosts that inhabit Hogwarts, there is also a famous and disruptive poltergeist. In the Harry Potter universe, Peeves is the most infamous poltergeist in British history and has “lived” at Hogwarts since 993. Many students and teachers enjoy Peeves, but he is a “pet peeve” for the caretakers at the school who have to clean up his messes. According to Pottermore, there has been many efforts to get rid of Peeves. The most recent (and most calamitous) was in 1876 when the caretaker at the time set a trap baited with weapons he figured Peeves wouldn’t be able to exist. Peeves, of course, managed to steal all the weapons (including cutlasses, crossbows and a cannon) and proceeded to go on a rampage. He only calmed down when school administrators signed a contract with him that allowed him one free swim in the boy's lavatory every week, as well as a new hat.
According to Rubeus Hagrid, Hogwarts is the safest place there is in the magical world, even safer than Gringotts, the bank where wizards store their money, which is why the Philosophers’ Stone was kept in the school.