The Shrieking Shack, on the outskirts of Hogsmeade, is believed to be the most haunted building in Great Britain. Connected to Hogwarts by a secret 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 the noise and mistook it for violent spirits. This rumour, encouraged by Hogwarts' Headmaster Albus Dumbledore, led to the Shrieking Shack being officially regarded as the most haunted building in Britain
