All over the world, there are unique and breathtaking sounds that you can only hear in one specific place. In this episode, we travel to two of the most astounding sonic wonders in the United States. The first is a hidden sound installation in Times Square that might be the most visited art exhibit on Earth. The second is an enormous organ built right into the rock of an ancient Virginian cave. These stories originally aired on the Atlas Obscura podcast. Sign up for Twenty Thousand Hertz+ to get our entire catalog ad-free. If you know what this week's mystery sound is, tell us at mystery.20k.org. Follow Dallas on Instagram, TikTok and LinkedIn. Watch our video shorts on YouTube, and join the discussion on Reddit and Facebook. Subscribe to Atlas Obscura wherever you get your podcasts. Get a FREE Netsuite KPI Checklist at netsuite.com/20k. Sign up for a one-dollar-per-month trial at shopify.com/20k. Claim your $75 sponsored job credit at indeed.com/hertz. Episode transcript, music, and credits can be found here: https://www.20k.org/episodes/auralobscura Learn more about your ad choices. Visit megaphone.fm/adchoices