8. Dr. H.H. Holmes
Dr. H.H. Holmes was a twisted serial killer who built a “Murder Castle” in Chicago with the intention to kill as many victims as possible. The 100-room building had long, winding corridors that would disorient victims. It also had trapdoors, false walls, and gas chambers. Holmes then sold the cadavers to medical research institutions, and the organs were traded on the black market.
On April 11, 1896, he wrote a full letter of confession to the Philadelphia North American newspaper:
I was born with the devil in me. I could not help the fact that I was a murderer, no more than the poet can help the inspiration to sing. I was born with the “Evil One” standing as my sponsor beside the bed where I was ushered into the world, and he has been with me since.
One month later, he was hanged at Moyamensing Prison for his crimes.