Anechoic chamber is situated in South Minneopolis and is called the quietest room of the world.But where this room is so quiet it is not necessary that your mind will also remain silent.
In this room even a small noise is magnified which means that you can even hear your heartbeat.This sounds are so dense that any person can get hallucinated.This room is so scary that the maximum time somebody has stayed inside this room is 45 minutes.
Image Source:http://www.egglets.com/news/2012/04/14/id-55393/orfield-anechoic-chamber-in-minneapolis-minnesota-so-scary-quiet/
