There's a book, whose title I cannot remember; something about zero db, or searching for silence. I heard the author interviewed on NPR and it sounded like a cool premise. Basically, he was inspired by life in noisy NYC to seek out absolute silence and wrote about his visits to various quiet places, culminating in an anechoic chamber. Being a fan of silence myself and also finding it elusive, I've been looking for that book, so if anyone happens to know its title and author, let me know.