Hoa Lo Prison (Hanoi Hilton)

Hỏa Lò Prison was a prison in Hanoi originally used by the French colonists in Indochina for political prisoners, and later by North Vietnam for U.S. prisoners of war during the Vietnam War. During this later period, it was known to American POWs as the "Hanoi Hilton". Following Operation Homecoming, the prison was used to incarcerate Vietnamese dissidents and other political prisoners, including the poet Nguyễn Chí Thiện. The prison was demolished during the 1990s, although its gatehouse remains a museum.

Source: Wikipedia