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 Trail of the Whispering Giants The Trail of the Whispering Giants is a collection of sculptures by Hungarian-born artist Peter Wolf Toth. The sculptures range in height from , and are between in diameter. In 2009, there were 74 "Whispering Giants", with at least one in each of the 50 U.S. states, as well as in Ontario and Manitoba, Canada, and one in Hungary. One in Oregon was removed in 2017 after irreparable windstorm damage, reducing the total to 73. In 1988, Toth completed his goal of placing at least one statue in each of the 50 states, by carving