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