On the weekend, a person came out to visit the Ancient Observatory beside Jianguomen. The first time I came here was probably because of the holidays. Many parents took their children to visit the observatory. The observation instruments here were all made in Kangxi period of the Qing Dynasty. Today, they have a history of several hundred years. There are seven instruments on the observatory. They are all carved dragons and phoenixes, ancient fragrance and ancient color. Although they are all introduced, they can't understand what they are doing. They have to admire the wisdom of the ancient people. In the era of science and technology and underdevelopment, they can design these precision instruments. There are three exhibition halls under the observatory, which show some scientific and technological achievements of ancient China. If you have children, it's good to take them with you. You can learn a lot of knowledge that you don't have in the textbooks.