Imperial Vault of Heaven (Huang Qiong Yu)

Directly north of the Circular Altar, this smaller version of the Hall of Prayer was built to store ceremonial stone tablets. The vault is surrounded by the circularEcho Wall (Huiyin Bi).In years past, when crowds were smaller and before the railing was installed, it was possible for two people on opposite sides of the enclosure to send whispered messages to each other along the wall with remarkable clarity. You can still experience this magical acoustic effect at the Western Qing Tombs, but there's little hope of enjoying it here.

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