Finally, we crested the Changla pass, which a sign told us was at 17,800 feet, the third highest in the world &mdash with a road over it, presumably. Ahead, the sun was painting amber streaks on the snow. We leaned towards it, wishing it on ourselves as we descended into a valley dominated by a gigantic crag, its puckered rock making demon faces like some protector deity from a monastery gate. In the valley, the immaculate military highway pushed on like an unlikely Formula 1 track through a boulder-strewn wilderness. The mountains were apricot, plum and champagne, sometimes crinkled with veins of snow. A frozen stream threaded its way through a sandy bed, the colour of fried egg. Parallel to it ran a telegraph line, fragile in the fierce wind, like some pioneering enterprise, determined against the odds.