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The Imperial Vault of Heaven (皇穹宇) is a single-gabled circular building, built on a single level of marble stone base. It is located south of the Hall of Prayer for Good Harvests and resembles it, but is smaller. It is surrounded by a smooth circular wall, the Echo Wall, that can transmit sounds over large distances. The Imperial Vault is connected to the Hall of Prayer by the Vermilion Steps Bridge, a 360 meter long raised walkway that slowly ascends from the Vault to the Hall of Prayer.