Hogwarts is famously the least safe school imaginable, as made staggeringly clear by the number of dangerous magical creatures and dark wizards that broke into the castle while Harry Potter was a student. Clearly, despite the famed protective spells that encircle the school's grounds, Hogwarts has a serious security problem. That probably isn't helped by the fact that there are numerous secret passageways in and out of the castle.

Many of these passages were discovered by Harry's father, James Potter, and his friends during their Hogwarts careers, and were later utilized by first Fred and George Weasley and then Harry himself thanks to the Marauder's Map. Others are so secret, however, that not even the best rule-breakers in the school figured out their existence. Likewise, some were the subject of intense speculation by fans for decades, before their locations were finally confirmed. Here is every secret passage hidden in Hogwarts. Although, seeing as the castle apparently has more holes than a leaky cauldron, there may well be more discovered in the future.

Harry Potter fans may not know why Rubeus Hagrid was expelled from Hogwarts but still allowed to live there.

Although the secret passageways that lead out of Hogwarts are of the most interest, it's still worth mentioning the many secret passages that lead to different points within the castle's walls. These are generally much more well-known to both the student body and the Hogwarts staff alike, with Filch claiming to be aware of all of them. The most notorious of these internal passageways has to be the secret entrance to the Chamber of Secrets, which is hidden in the girls' bathroom on the second floor.

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