Noun
An exhibition which displays horrific items, such as instruments of torture, frightful crimes being committed, etc.
Any place in which horrific things take place or have taken place.
Source: en.wiktionary.orgFor most people, chemotherapy is no longer the chamber of horrors we often conceive it to be. Yes, it is an ordeal for some people, but it wasn't for me, nor for most of the patients I got to know during my four months of periodic visits to the chemo suite. Geraldine Brooks
As a boy I used to go to the Chamber of Horrors at the annual fair, to look at the wax figures of Emperors and Kings, of heroes and murderers of the day. The dead now had that same unreality, which shocks without arousing pity. Ernst Toller