They are very strict on how you approach the mausoleum. No camera, no hats, no hands in pockets. You are frog marched along outside up to the mausoleum. Once inside you mustn't stop, but there is planets of time to see Ho Chi Minh embalmed in his coffin. He's been there for 40 years and is flown to Russia yearly for maintenance. A bit of a weird experience but why not?