The special website has many historical videos of the nine major websites of the central government, because it is a science and education channel. I suggest you go to BBC, CNN and Discovery Channel. The historical videos of those websites are well preserved and shot a lot. Or if you are too troublesome, you can directly search Baidu for the historical videos you need, but many of these videos are incomplete and irrelevant, and it takes a lot of patience to screen them out. The most important thing is to know the keywords when looking for videos, so that the accuracy of search can be high.