Mustang (moo-stahn), one of the last outposts of Tibetan culture, is so isolated and protected that no Westerner set foot inside its borders for centuries. But in the early 1990s, this untouched society set high in the Himalayas opened its borders for the first time, exposing an ancient world’s dazzling sacred relics long damaged by the elements and neglect.

In this remarkable NOVA documentary western conservators are shown helping to preserve a Buddhist temple and its murals using both traditional and modern techniques.