H. H. Holmes was known for robbing graves, stealing horses, insurance fraud, and... murder. The United States' first serial killer allegedly had up to 200 victims fall prey to the soundproof rooms, secret passages, trapdoors, acid vats, pits of quicklime, gas chambers, and crematorium in his 'Murder Castle'.
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Sources:
Did Serial Killer H.H. Holmes Really Build a ‘Murder Castle’? | HISTORY
The Enduring Mystery of H.H. Holmes, America's 'First' Serial Killer | Smithsonian
Exhumation confirms gravesite of notorious Chicago serial killer H.H. Holmes - Chicago Tribune
H.H. Holmes: Biography, Serial Killer, Murderer
H.H. Holmes - Crime Museum
H. H. Holmes - Wikipedia
Mass murderer Dr H H Holmes: The story of the Chicago Murder Castle, plus Benjamin Pitezel & his other victims - Click Americana
Michigan Today » A double dose of the macabre
Murder Castle ‑ H.H. Holmes, Chicago World's Fair & Layout | HISTORY
New Master List of HH Holmes Victims – Mysterious Chicago
St. Louis Post-Dispatch. Holmes selling Mortgaged Goods - Newspapers.com™
The Trial of Herman W. Mudgett Alias H.H. Holmes for the Murder of Benjamin ... - Herman W. Mudgett - Google Books