Although Beijing’s Imperial Vault of Heaven itself astounds tourists and worshippers, it is the temple’s outer wall that truly amazes those who discover it. Dubbed the “Echo Wall,” this temple’s surrounding circle utilizes the theory of sound waves, enabling long distance conversation to travel the length of the wall. Words whispered from the landmark’s east base reverberate along the wall allowing an individual at the west side to hear the spoken words.  At the Echo Wall, speech can travel more than 100-feet unaided by modern technology – now that is true wireless communication!

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