A good six thousand or so years ago, Northern Europe was covered in swamp-like, stagnant pools of dead plant. These bogs happened to be great places to get rid of stuff, and so our ancestors, being not much different than we are today, really, filled them with refuse and the occasional body.
We're not exactly sure why those bodies were put there. The prevailing theory is they were human sacrifices, but it's entirely possible that bogs were just convenient places to store dead people. Either way, there they stayed, buried and preserved for thousands of years, just waiting for the chance to scare the crap out of an eight-year-old girl [...]