
The graves were discovered during the construction of a roadway near the Polish town of Gliwice, where archaeologists are more accustomed to finding the remains of World War II soldiers, according to The Telegraph.
But instead of soldiers, the graves contained skeletons whose heads had been severed and placed on their legs. This indicated to the archaeologists that the bodies had been subject to a ritualized execution designed to ensure the dead stayed dead, The Telegraph reports.
By keeping the head separated from the body, according to ancient superstition, the "undead" wouldn't be able to rise from the grave to terrorize the living. Decapitation was one way of achieving that; another way was hanging the person by a rope attached to the neck until, over time, the decaying body simply separated from the head.
There were other, equally bizarre ways of dealing with vampire burials, according to research published by forensic anthropologist Matteo Borrini. He cites the case of a woman who died during a 16th-century plague in Venice, Italy. The woman was apparently buried with a brick wedged tightly in her open mouth, a popular medieval method of keeping suspected vampires from returning to feed on the blood of the living. The woman's grave might be the earliest known vampire burial ever found.