Stone believes studying "dark tourism" will help the appropriate development and management of such sites and attractions.
The institute defines "dark tourism" as the "act of travel to sites, attractions and exhibitions of death, disaster or the seemingly macabre".
In Cambodia, the surviving remnants of the Khmer Rouge regime encourage visitors to buy trinkets after visiting the Tuol Sleng Genocidal Museum, where a display of skulls commemorates the 14,000 victims of Pol Pot's regime who died at the former torture camp.
However, at the Dahmer attraction - which was condemned by the families of the Milwaukee killer's victims - visitors are also taken on a walking tour of the bars where the killer, who mutilated and cannibalised many of his 17 victims, picked up his young prey.
The institute includes the 1.5 million people who annually visit the Auschwitz-Birkenau Memorial in Poland, and those who pay their respects at Ground Zero while visiting New York, as "dark tourists".
Professor John Lennon, director of the Moffat Centre for Travel and Tourism Business Development in Glasgow, who coined the phrase "dark tourism" in a 1996 paper, believes these dark tourists like to imagine how they might have reacted facing such a disaster.
- Independent