Lhasa in 3 days: the Tibetan capital at 3,656m where pilgrims prostrate themselves on stone circuits around a temple that has been holy for 1,400 years, where the Dalai Lama's golden-chortened winter palace rises 117m from a red hill, where monks debate philosophy with theatrical hand-claps every afternoon, and where a 4,718m turquoise lake reflects the highest railway on Earth.