Far removed from Tehran’s bustling tin-roofed teashops and Isfahan’s verdant pomegranate gardens, the deserts known as Dasht-e Kavir and Dasht-e Lut meet at the city of Yazd, once the heart of the Persian Empire. Walking across the wind-whipped plains of the forgotten city, a young Iranian woman dressed in colorful floral garbs points out a sand-dusted tower hovering in the distance like a dormant volcano under a relentless sun. “This is where we put tens of thousands of corpses over the years,” she explains with a congenial smile.