Three Echo Stones is outside of the gate of the Imperial Vault of Heaven. If you speak facing the Vault while standing on the first stone, you will hear one echo; standing on the second and then the third stone, you will hear two and three echoes respectively.
Another interesting and famous place for you to visit is called Echo Wall owning special feature. The wall encloses the Imperial Vault of Heaven. Its perimeter is 193 meters.
If you and your friend stand at the east and the west roots of the wall respectively and you whisper a word, then your friend will hear clearly what you say. Isn't it interesting? The phenomenon utilizes the theory of sound wave.
Besides carefully designed buildings, there are also some other scenes that you can enjoy like Nine-Dragon Cypress. It got its name from branches which look like nine dragons wind with each other. It was said that the cypress was planted more than 500 years ago. Really, a grandfather tree!
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