Herman Webster Mudgett (May 16, 1861 – May 7, 1896), better known under the name of Dr. Henry Howard Holmes or more commonly just H. H. Holmes, was one of the first documented serial killers in the modern sense of the term. In Chicago, at the time of the 1893 World's Columbian Exposition, Holmes opened a hotel which he had designed and built for himself specifically with murder in mind, and which was the location of many of his murders. While he confessed to 27 murders, of which nine were confirmed, his actual body count could be up to 200. He brought an unknown number of his victims to his World's Fair Hotel, located about 3 miles (4.8 km) west of the fair, which was held in Jackson Park. Besides being a serial killer, H. H. Holmes was also a successful con artist and a bigamist.
Englewood neighborhood. Holton gave Holmes a job, and he proved himself to be a hardworking employee. After the death of Holton's husband, Holmes offered to buy the drugstore from Holton, and she agreed. Holmes purchased the store mainly with funds obtained by mortgaging the store's fixtures and stock, the loan to be repaid in substantial monthly installments of $100 (worth $2,600 in 2015). Holton was never seen or heard from again, and whenever any regular customers asked Holmes about her whereabouts after she sold the drug store to him, he would say that she moved to California to be close to relatives.
Holmes purchased an empty lot across from the drugstore where he built his three-story, block-long hotel building. Because of its enormous structure, local people dubbed it "The Castle". The building was 162 feet long and 50 feet wide. The address was 601-603 West 63rd Street. It was called the World's Fair Hotel and opened as a hostelry for the World's Columbian Exposition in 1893, with part of the structure devoted to commercial space. The ground floor of the Castle contained Holmes' own relocated drugstore and various shops, while the upper two floors contained his personal office and a labyrinth of rooms with doorways opening to brick walls, oddly-angled hallways, stairways leading to nowhere, doors that could only be opened from the outside and a host of other strange and deceptive constructions. Holmes was constantly firing and hiring different workers during the construction of the Castle, claiming that "they were doing incompetent work." His actual reason was to ensure that he was the only one who fully understood the design of the building.