Acoustic anechoic chambers are enclosed spaces which are highly isolated from outside noise sources and also highly absorbent to any noise produced inside. The one at Orfield Laboratories in Minneapolis, Minnesota, USA is in the Guinness Book of World Records as the quietest place on Earth. There is an urban legend that spending more than 30 minutes in one will drive you crazy.
I realize that I can probably peek into some of the research facilities, but I would like to test my sanity against one. By this I mean that I would like to spend up to 1 hour alone inside of a reasonably well constructed chamber, but is doesn't have to be at the level of quality of 'the quietest place on Earth'.
Is it possible, as a tourist, to visit an anechoic chamber where one can experience acoustic deprivation for up to an hour? I am interested in locations anywhere in the world.
Related question: Where is the quietest place on Earth?