HARI SREENIVASAN:

And to our NewsHour Shares, something that caught our eye that may be of interest to you, too.

This year marks the 60th anniversary of the debut of a musical oddity, the Great Stalacpipe Organ of Virginia's Luray Caverns.

NewsHour recently got a behind-the-scenes look at the one-of-a-kind instrument from those who know it best.

Cavern historian John Shaffer starts us off.