A medieval monument to religious pluralism, hidden in the mountains of Afghanistan. One of the great wonders of the medieval world is a very tall, heavily ornamented minaret nestled in a green valley at the edge of the Jam river in what is now Afghanistan. Often called the Minaret of Jam, the monument was almost a millenium ago illuminated by a torch at its top, and surrounded by a thriving town with small industries and outlying farms. What’s remarkable is that the writing on the minaret and archaeological remains nearby strongly suggest that the city harbored a population of Muslims,…