A monk plays the dungchen (Tibetan long horn) during the...

LO MONTHANG, UPPER MUSTANG, NEPAL - 2011/05/29: A monk plays the dungchen (Tibetan long horn) during the Tiji Festival in Lo Manthang. Hidden in the rain shadow of the Himalaya in one of the most remote corners of Nepal lies Mustang, or the former Kingdom of Lo. Hemmed in by the world's highest mountain range to the south and an occupied and shuttered Tibet to the north, this tiny Tibetan kingdom has remained virtually unchanged since the 15th century. Today, Mustang is arguably the best-preserved example of traditional Tibetan life left in the world. (Photo by Taylor Weidman/LightRocket via Getty Images)