Dueling icons dominate the skyline of Yokohama, where the Landmark Tower rises as if to challenge sacred Mount Fuji. A dizzying whirl of construction here transformed the aging warehouse district into a new complex of hotels, offices, condos, and amusements, including a mega-Ferris wheel. Work on the 70-story skyscraper- at 971 feet the tallest in Japan- began in 1990, one year after the country's "bubble economy" began to burst.