In "Istanbul: City of a Hundred Names," Magnum photographer Alex Webb displays his particular ability to distill gesture, color and contrasting cultural tensions into a single, beguiling frame. He presents a vision of Istanbul as an urban cultural center, rich with the incandescence of its past--a city of minarets and pigeons rising to the heavens during the early-morning call to Muslim prayers--yet also a city riddled with ATM machines and clothed...