RT @PittsburghPG: Hiding in plain sight: Noise muffling stru aspwv2015-10-29T00:00:00-04:00October 29th, 2015|Twitter| RT @PittsburghPG: Hiding in plain sight: Noise muffling structures made to look like common buildings https://t.co/Hu9VAuVl54 https://t.co/… Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail