Humanity has achieved great heights, but some achievements are more sinister than others. H. H. Holmes, a notorious serial killer, built a "Murder Hotel" in downtown Chicago, featuring trap doors, chutes, and hidden passageways. He used the hotel to murder victims, beating, strangling, gassing, and torturing them before their deaths. His confessed 27 murders are believed to be just a fraction of the actual number, with estimates ranging from 200 to over 200.
H. H. Holmes: Original Evil
The Dark Lord, a serial killer, commits heinous crimes in a notorious "murder castle", claiming the lives of approximately 200 people, with some speculating he may be Jack the Ripper.