I have lived in Hanoi for four months, which is longer than most tourists. I think Hanoi is special. According to my experience, most Chinese people don't like Hanoi very much, but most Europeans and Americans like Hanoi more. This is mainly because many Europeans and Americans like those old streets. My current American boss has said several times that he wants to go to Hanoi to see those old streets. When I was in Hanoi before, a German told me that he didn't think Saigon was good, and he personally liked Hanoi's old streets more. Some time ago, a Malaysian also told me that she was very fascinated by Hanoi, and she went to Hanoi for a few days during the New Year. So if there is anything worth taking a detour to see in Hanoi, it is the 36 old streets, French architecture with Vietnamese style. I think when traveling to a country, you must go to the capital and the financial center (or maybe one) to see it, so that you can understand the country more comprehensively and have more confidence to say that you have visited the country. I think when you ask this question, you must be inclined to take a detour to see it. In addition to the 36 old streets, Hanoi is also proud of the fact that it is one of the top ten cities in the world for street food (although I personally don't feel it very deeply), and it seems to rank quite well. You can go there to experience the various street foods that are everywhere. If you still feel that it is not convincing enough, Hanoi is the representative of North Vietnam. In fact, North Vietnam and Central Vietnam are different. If you don't go to Hanoi, you won't be able to experience some of the differences between South Vietnam and North Vietnam. At the same time, it is also good to see what China felt like fifteen years ago.