Among the many monuments that stand across India as mute witnesses to civilizational upheaval, few are as historically layered and symbolically significant as Adhai Din Ka Jhopra in Ajmer. Today, it is often introduced as one of the oldest surviving mosques in Rajasthan. Yet beneath its arches, carved pillars and weathered stone lies the unmistakable memory of a lost Hindu-Jain centre of learning — a Sanskrit college and temple complex that once…