The Forbidden City is one of the cultural heritage of our country and ranks among the best in the world. This place, in ancient times, was the palace where the emperor lived, and the civilian population could not enter at will. Now, this place is free to watch, and we are able to watch the legendary "Royal Palace" up close. Here, there is a very special rule, that is, when you visit the Forbidden City, you have to leave when you are dark. The answer is hard to think of, let's get to know it today.