The highgate cemetery is rumored to have a vampire living in it.
In the late 60s early 70s, a psychic investigator named David Farrent Went to investigate the place only to encounter a dark figure that reportedly drained him of energy and then slinked away.
This was one of the more mild reports.
Other people have reported to see this thing close up and have described it as a walking, rotting corpse with pointy, vampire like teeth.
The thing is said to live under the cemetery, in a series of tunnels that once were part of an ancient castle that originally occupied the grounds.