Section 4 at the Remembering the Killing Fields Exhibit, Chicago The Remembering the Killing Fields exhibit opened in 2011 and is a permanent exhibit at the National Cambodian Heritage Museum (formerly known as the Cambodian American Heritage Museum) in Chicago. The fourth section of the exhibit, “The Killing Fields,” documents the horrors and death tolls of the Killing Fields across Cambodia and Tuol Sleng (S-21), the school-turned-prison torture and execution center in Phnom Penh. (Cambodian Association of Illinois)