Perched at the tip of Europe, gazing across to the shores of Asia, Istanbul remains as much a city of crossroads as it has been for the past two millennia. The history of this fabled metropolis--known at first as Byzantion, then Constantinople, and now Istanbul--is glorious, grandiose, and astounding. No other city has stood at the center of world events for so long, a home to great empires and diverse cultures from the Greeks to the Romans, the Italians...