Whispering gallery is a term used to describe a specific type of architectural feature, typically found in large grand structures such as cathedrals and galleries. It consists of a curved or circular room or hallway that creates a unique acoustic effect where even the slightest whisper can be heard clearly from one end of the room to the other. There are several synonyms for a whispering gallery, including a spherical room, echo chamber, sound mirror, or acoustic chamber. These architectural marvels have been fascinating audiences for centuries and continue to be a popular feature in modern constructions.