Across Asia, some countries are betting that a new capital can solve old problems. But history shows that capitals rarely move as neatly as their planners imagine, experts say. ULAANBAATAR: In the early 13th century, after uniting the nomadic Mongol tribes, the ruler Genghis Khan searched far and wide for a sacred centre for his sprawling empire. He had a shamanic vision, according to Mongolian folklore, that told him of a blessed valley that lay under the gaze of the Eternal Blue Sky, the