Visiting the prison which was also during the war called Hanoi hiltons is definately worthwhile. Originally a french colonial prison it has a quite a morbid past with most inmates being beaten

and mis treated, making them thin enough to even fit through tiny sewage bars to escape one time. Also interesting to learn American fighters from the war were kept there after being shot down, but given 5* treatment, even making Xmas lunch vs the local prisoners who starved and lived in terrible living conditions!
23rd October 2015