Hoa Lo Prison has an interesting history. The French used the prison to detain Vietnamese political prisoners during their era of rule, and then Hoa Lo was used for captured American POWs during the Vietnam War. Only part of the building is still intact, and preserved as a historical site; sadly, much of the space has been taken over to build new high-rise buildings.
The prison tour was quite an interesting experience, seeing how the government presents its historical perspectives. For one, it focuses mostly on the French brutal treatment of Vietnamese prisoners, and only dedicates the last part of the tour to the American experience. Additionally, it tries to claim that the Americans experienced benevolent treatment in the prison, showing videos of POWs laughing, playing games, eating good meals, and even celebrating Christmas. You would think from their claims that the Americans were honored guests rather than enemy soldiers.
Indeed, there is a bit of irony in the nickname "Hanoi Hilton," created by the Americans. They chose this nickname ironically, yet the description in the prison uses this American nickname as literal proof of the fine experience that the Americans received.
Yet I'm sure there must be some grain of truth to their claims. There always exist multiple histories amongst all the sides of any conflict, and I'm aware that I've only grown up with the American one.