Once a year, three crystal chandeliers in the lobby of Downtown Pittsburgh's Omni William Penn Hotel are lowered to the floor for cleaning and inspection. It’s a tedious, day-long process that involves a meticulous, hand-chosen staff - and thousands of beautiful crystals. WQED documents this ceremonial spectacle at one of America's historic hotels.

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Tour this unique exhibition, "National Geographic: 50 Greatest Wildlife Photographs."