Deep in the Luray Caverns of Virginia, which are known as the biggest cave complex in the Eastern United States, sits the largest musical instrument in the world.
The Great Stalacpipe Organ appears at first to be a normal organ, but instead of using pipes, the organ is wired to soft rubber mallets poised to gently strike stalactites of varying lengths and thicknesses. When the keyboard is played, the entire subterranean landscape becomes a musical instrument.