Some of the world's scariest stories are nothing more than myth or folklore, with little evidence to back them up, but others are totally true and proven. History has shown that some people are capable of shocking atrocities, and many mysterious incidents have occurred without any definitive explanations.
From ghost ships to psychopathic serial killers, history is littered with terrifying tales to keep you up at night, and many of these stories would work wonderfully on the silver screen. Five of the most powerful words in cinema are, after all, "Based on a true story".
Horror movie writers are always seemingly finding new ways to get a bunch of dumb teens into a haunted house, but why bother with tired clichés and boring stories when the real world has provided such a wealth of terrifying tales?
There's something extra scary about watching a horror film based on real events, as it becomes so much easier to imagine yourself in the middle of the action. If any screenwriters or directors are looking for inspiration, these terrifying and true tales will definitely make audiences leave the lights on when they go to bed.