[5] Conditions for political prisoners in the "Colonial Bastille" were publicised in 1929 in a widely circulated account by the Trotskyist Phan Van Hum of the experience he shared with the charismatic publicist Nguyen An Ninh.
[6][7] Following the defeat at the Battle of Dien Bien Phu and the 1954 Geneva Accords the French left Hanoi and the prison came under the authority of the Democratic Republic of Vietnam.
[8] Thereafter the prison served as an education center for revolutionary doctrine and activity, and it was kept around after the French left to mark its historical significance to the North Vietnamese.
There is some disagreement among the first group of POWs who coined the name but F-8D pilot Bob Shumaker[11] was the first to write it down, carving "Welcome to the Hanoi Hilton" on the handle of a pail to greet the arrival of Air Force Lieutenant Robert Peel.
[15] The Hỏa Lò was one site used by the North Vietnamese Army to house, torture, and interrogate captured servicemen, mostly American pilots shot down during bombing raids.
[16] Although North Vietnam was a signatory of the Third Geneva Convention of 1949,[16] which demanded "decent and humane treatment" of prisoners of war, severe torture methods were employed, such as rope bindings, irons, beatings, and prolonged solitary confinement.
[21] This created the "Camp Unity" communal living area at Hỏa Lò, which greatly reduced the isolation of the POWs and improved their morale.
[14][21] After the implementation of the 1973 Paris Peace Accords, neither the United States nor its allies ever formally charged North Vietnam with the war crimes revealed to have been committed there.
A considerable amount of literature emerged from released POWs after repatriation, depicting Hỏa Lò and the other prisons as places where such atrocities as murder, beatings, broken bones, teeth and eardrums, dislocated limbs, starvation, serving of food contaminated with human and animal feces, and medical neglect of infections and tropical disease occurred.
Among the last inmates was dissident poet Nguyễn Chí Thiện, who was reimprisoned in 1979 after attempting to deliver his poems to the British Embassy, and spent the next six years in Hỏa Lò until 1985 when he was transferred to a more modern prison.
After being in storage in Vietnam for six years and nearly another ten in Canada, the cells were reconstructed using the original materials and turned into a permanent exhibit that opened in 2023 at the American Heritage Museum in Stow, Massachusetts.