Whispering gallery to the walls, an effect that was discovered in the whispering gallery of St Paul's Cathedral in London. The extent to which the sound travels at St Paul's can also be judged by clapping in the gallery, which produces four echoes. Other historical examples are the Gol Gumbaz mausoleum in Bijapur and the Echo Wall of the Temple of Heaven in Beijing. A hemispherical enclosure will also guide whispering gallery waves. The waves carry the words so that others will be able to hear them from the opposite side of the gallery. The gallery may also be in the form
Trail of the Whispering Giants one in Hawaii, and in 2008, he created his first "Whispering Giant" in Europe, Stephen I of Hungary in Délegyháza, Hungary along the Danube River. In 2009, eight more "Whispering Giants" were planned. (Update February 2, 2015) "The Trail of the Whispering Giants" is an ongoing project and much of the material here especially the chart below is out of date and too extensive to edit fully this article. A traveler, David Schumaker, went on a quest to identify all the "Whispering Giant" statues and has documented 57 existing statues and identified 12 that are now missing or destroyed since