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
National Gallery in Prague National Gallery in Prague The National Gallery in Prague () is a state-owned art gallery in Prague, which manages the largest collection of art in the Czech Republic. The collections of the gallery are not housed in a single building, but are presented in a number of historic structures within the city of Prague, as well as other places. The largest of the gallery sites is the Veletržní Palác, which houses the National Gallery's collection of modern art. It is one the largest museums in Central Europe. The history of the National Gallery dates back to the end of the