The name Herman Webster Mudgett is largely forgotten, but he was an infamous figure in late 19th century America, where he was better known as H. H. Holmes.
Holmes was a successful swindler and serial killer who built a "Murder Castle" in Chicago, a three-story human abattoir complete with shops, apartments, and its own crematorium. He was captured in 1895 and wrote a death-row memoir in which he claimed a total of 27 murder victims, including men, women and children. Mudgett was hanged and, at his request, the coffin filled with concrete to discourage grave robbers.
True crime buffs remember the Castle, but there is another aspect of the story that suggests the man's malignant influence was not cemented into the ground with him.
According to David Franke's book, The Torture Doctor:
Source - Forteana
Stranger Than Fiction Stories by M.P. Pellicer