The Shrieking Shack is an abandoned house that was placed in Hogsmeade. The Shrieking Shack was built as part of the precautions set in place whilst Remus Lupin was at Hogwarts. Lupin used the Shack for his transformations into a werewolf during the full moon—it was he who made the terrible noises that were rumoured to be violent spirits.
The secret entrance, also the only entrance of the Shrieking Shack can also be found hidden within the roots of the Hogwarts Whomping Willow.
The secret entrance, also the only entrance of the Shrieking Shack can also be found hidden within the roots of the Hogwarts Whomping Willow.