HAVE YOU HEARD OF WHISPERING (ECHO EFFECT) DOMES

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St. Paul's Cathedral in London Gol Gumaz, built by Bijapur Sultan, Adil Shaha (Located at Bijapur, North Karnataka, India). If you speak or make sound, the exact words or sounds run round the dome. The sound waves are carried from one side to the opposite other side of the inner dome. There is echo effect of voice and sound. QUESTION IS: THIS IS AN ARCHITECTURAL MARVEL. HOW THIS IS POSSIBLE? IS THERE ANY OTHER SUCH ARCHITECTURAL MARVELS ELSEWHERE IN THE WORLD? HAVE ANY OF YOU SEEN AND EXPERIENCED THE ABOVE MENTIONED PLACE/WOULD LIKE TO?