The Luray Caverns in the Blue Ridge Mountains of Virginia are home to an instrument draws out the secret sounds of millenia-old stone. 
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The Atlas Obscura Podcast

The Great Stalacpipe Organ

An audio guide to the world’s strange, incredible, and wondrous places. Co-founder Dylan Thuras and a neighborhood of Atlas Obscura reporters explore a new wonder every day, Monday through Thursday. In under 15 minutes, they’ll take you to an incredible place, and along the way, you’ll meet some fascinating people and hear their stories. Our theme and end credit music is composed by Sam Tyndall.