<P> The Shrieking Shack, on the outskirts of Hogsmeade, is believed to be the most haunted building in Great Britain . It stands a little way above the rest of Hogsmeade, with boarded - up windows and an overgrown garden . It's described to be slightly creepy even in daylight . Connected to Hogwarts by a secret tunnel underneath the Whomping Willow, which was planted especially to conceal the tunnel, the Shrieking Shack was used by Remus Lupin, a werewolf, to hide during the full moon to avoid harming fellow students or others . The villagers heard Lupin's howls while he resided there, and mistook it for violent spirits . This rumour, encouraged by Dumbledore, led to the Shrieking Shack being officially regarded as the most haunted building in Britain . Apparently, the tunnel through the Whomping Willow is the only way to get in to the Shrieking Shack . </P> <P> In Prisoner of Azkaban, the Shrieking Shack becomes part of the dramatic conclusion of the book when Sirius returns to the school . He drags Ron and his pet rat, Scabbers, there intending to kill Scabbers . It is revealed that Scabbers is the Animagus Peter Pettigrew, Black's former friend who had betrayed the Potters to Voldemort, a crime for which Black had been blamed and sentenced to lifetime imprisonment in Azkaban . In the book Deathly Hallows, Snape is killed in the Shrieking Shack by Voldemort's snake, Nagini . </P> <P> Azkaban is a prison where wizards who violate the laws of the British wizarding world are sent . Only one other such prison, Nurmengard, is mentioned in the books . According to Half - Blood Prince, Azkaban is "in the middle of the North Sea". Sirius Black says that when he escaped from Azkaban while in his animagus form as a dog, he swam to Britain and then travelled northwards to get to Hogwarts . This implies that Azkaban is at a lower latitude than Hogwarts, which is in Scotland . Although Azkaban's appearance is not described in detail in the books, it is mentioned to have grounds outside the prison where prisoners who have died are buried . In the movie adaptations it appears to be a tall triangular building, somewhat hollow in the middle . </P> <P> Many of the prisoners were supporters of Voldemort (known as Death Eaters), though some misunderstandings have resulted in others' imprisonment . For instance, Sirius Black was imprisoned without trial after Peter Pettigrew killed a dozen Muggles, faked his own death, and framed Sirius for these crimes; Sirius escapes after serving 12 years . Two years later, Harry is threatened with a term in Azkaban after he performs a Patronus Charm that saves both him and his cousin Dudley from a Dementor attack . Performing any of the Unforgivable Curses on a human is punishable by a mandatory whole life sentence in Azkaban, but that ban has been lifted for Aurors during wartime . Several characters throughout the series have performed the curses and not been punished accordingly . Other crimes which merit imprisonment here include assaulting the Ministry (for example, the Death Eaters detained in Order of the Phoenix), trespassing in the Ministry (Sturgis Podmore in Order of the Phoenix), being an unregistered Animagus, and impersonating an Inferius . </P>

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