The Murder Castle Of H.H. Holmes, America's First Serial Killer

The Murder Castle Of H.H. Holmes, America's First Serial Killer - KnowledgeNuts:
In 1893, Dr. H.H. Holmes built a sprawling, three-story brick building in downtown Chicago. The labyrinthine “Murder Castle” contained nearly 100 rooms, dead-end staircases, hallways that looped back onto themselves, and doors with only brick walls behind them.
In this grisly maze, Holmes murdered up to 200 people.
H.H. Holmes is widely regarded as America’s first serial killer, a title which he claimed with a vengeance during the 1893 World’s Fair in Chicago. 
He later confessed to 27 murders, although it’s believed that he may have actually killed hundreds. 
The victims were mostly visitors to the World’s Fair, and, for the most part, women.
After abducting them, Holmes brought them back to his self-styled Murder Castle, an outwardly unassuming building in Englewood.
But behind the innocent brick facade was a dark, windowless maze containing close to 100 rooms filled with torture devices.
As far as we know, nobody ever escaped once they were brought into the Murder Castle.