Fritz Haarmann’s Preserved Head - Known as the “Butcher of Hanover” and the “Vampire of Hanover” was a German serial killer who is believed to have been responsible for the murder of 27 boys and young men between 1918 - 1924. He was convicted, found guilty of 24 murders and executed. Haarmann was beheaded by guillotine on April 15, 1925. His head was preserved in a jar by scientists to examine the structure of the brain. Haarmann’s head is now kept at the Göttingen medical school.