I Was There S01E06 - Killer in the White City

Theo Wilson travels back in time to 1893 Chicago, finding himself in the lair of America's first famous serial killer, H.H. Holmes. But how did Holmes become such a prolific murderer? Theo follows Holmes dark road from conman, to the owner of a fiendishly engineered "murder castle," where he hunts his victims in the convenient shadow of the World's Columbian Exposition.