Established in 1979 in the premises of the Khmer Rouge prison S-21 in Phnom Penh, Tuol Sleng Genocide Museum (TSGM) has had a turbulent history, mirroring Cambodia's social and political transformations. The book brings together academics and practitioners from multiple fields who offer novel perspectives and sources on the site and reflect on the challenges the institution has faced in the past and will face in the twenty-first century as an archive, heritage, and education site, especially with the coming of the post-justice era in the country.