Located to the south of the Hall of Prayer for Good Harvests, the Imperial Vault of Heaven is also a circular building. It is surrounded by a smooth circular wall, known as the Echo Wall, which is famous for its amazing sound transmitting effects.The Imperial Vault is connected to the Hall of Prayer by an elevated 360 meter long brick path, named the Red Stairway Bridge. [Photo by Jia Yue for Chinadaily.com.cn]

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