Site of the Murder Castle
Chicago, Illinois
The most infamous site associated with any World's Fair was the "Murder Castle" of H.H. Holmes. It stood three miles west of the 1893 Columbian Exposition fairgrounds in Chicago. Holmes promoted it as a hotel for fairgoers, and apparently some of them went in and never came out. Investigators found it riddled with secret passages and hidden rooms. Estimates of Holmes' final murder toll range from 9 to 200; he confessed to 27. He was hanged in 1896 and the building was torn down in 1938. No monument stands on the empty lot, but people still like to visit it.