Heart of Heavenly Stone

The Heart of Heavenly Stone placed in the center of the top tier of the Circular Mound Altar. Around it there are nine circles, each with nine stones, altogether 3,402 pieces. They are of identical size and appearance and put closely together. They have remained intact during the past several hundred years. When people stand on the Heart of Heavenly Stone and shout echoes will be heard.

Echo Wall & Nine-Dragon Cypress

The circular wall surrounding the Imperial Vault of Heaven is 193.2 meters long, 3.7 meters high and 0.9 meter thick. If one speaks against the wall at one end, another can hear his voice at the other end of it. The Nine-Dragon Cypress outside the Echo Wall was planted 500 years ago. Its twining branches look like nine dragons.