What is the quietest place on Earth?

The quietest place on Earth is an anechoic chamber at Orfield Laboratories in Minneapolis, Minnesota, USA. The room is designed to be as soundproof as possible, and it has a background noise level of -9.4 dBA, which is equivalent to the sound of a person's breathing. The room is used for testing products and materials for their soundproofing properties, and it is also used for research on hearing and sound perception.