Consider yourself warned: You may be surprised by some of the entries on this list. Here are the 25 best horror movies based on true stories.

"Take a seat. This is a true horror story and veers sharply macabre." With a hook like that, it's no wonder Loab proceeded to take the internet by storm. The image of this mysterious woman is now ...

But it is perhaps even more terrifying because it is based on the true story of agency nurse Delia Balmer's near fatal relationship with axe murderer John Sweeney. Branded the 'scalp hunter ...

But creating a completely original, compelling, and terrifying horror story can be challenging ... claims that the film was "inspired by true events," though it's more of an amalgam of a few ...

Horror stems from storytelling, whereas true crime is born of journalism ... It ran as a serial story in The New Yorker weekly magazine before being published as a book in 1966.