The Grave of Pamela Voorhees
In the back lefthand side of the conservatory shrouded in darkness and fog is an eerie graveyard. Most of the graves you'll find here are unmarked with the exception of one that's tucked all the way in the back. This tombstone reads Pamela Voorhees. Walking up to the tombstone and centering it on your screen will cue some terrifyingly gorey sounds and this makes sense, seeing that Pamela is the mother of Jason Voorhees, himself.
We meet Mrs. Voorhees in the first Friday the 13th movie, where she abruptly makes an appearance and after discovering the bodies of one of the couselors, divulges the chilling story of how Jason drowned on the fateful day on Camp Crystal Lake. She then proceeds to go on a murderous rampage, attempting to kill Alice but fails and ends up meeting her own death.