![Penn scientists dig up evidence to settle questions about H.H. Holmes — first American serial killer - WHYY Penn scientists dig up evidence to settle questions about H.H. Holmes — first American serial killer - WHYY](https://whyy.org/wp-content/uploads/2017/09/hhholmes.jpg)
Penn scientists dig up evidence to settle questions about H.H. Holmes — first American serial killer - WHYY
![Trail of the Arch-Fiend: H.H. Holmes | Hoosier State Chronicles: Indiana's Digital Newspaper Program Trail of the Arch-Fiend: H.H. Holmes | Hoosier State Chronicles: Indiana's Digital Newspaper Program](http://blog.newspapers.library.in.gov/wp-content/uploads/2015/08/HH-Holmes-photo.jpg)
Trail of the Arch-Fiend: H.H. Holmes | Hoosier State Chronicles: Indiana's Digital Newspaper Program
![Mass murderer Dr H H Holmes: The story of the Chicago Murder Castle, plus Benjamin Pitezel & his other victims - Click Americana Mass murderer Dr H H Holmes: The story of the Chicago Murder Castle, plus Benjamin Pitezel & his other victims - Click Americana](https://clickamericana.com/wp-content/uploads/Herman-W-Mudgett-alias-H-H-Holmes-victims-1.jpg)
Mass murderer Dr H H Holmes: The story of the Chicago Murder Castle, plus Benjamin Pitezel & his other victims - Click Americana
![How serial killer H. H. Holmes slaughtered 200 in hotel with secret torture rooms and blowtorches hidden in walls | The US Sun How serial killer H. H. Holmes slaughtered 200 in hotel with secret torture rooms and blowtorches hidden in walls | The US Sun](https://www.the-sun.com/wp-content/uploads/sites/6/2020/08/NINTCHDBPICT000602685091.jpg)