Nestled amid the arid plains of Rajasthan, about 230 miles west of Delhi, Ladnun is the kind of town many travelers might pass without a second glance. Its narrow streets, whitewashed temples, and unhurried pace stand in stark contrast to India’s bustling metropolitan centers. This summer, however, the quiet town has become an unlikely destination for seekers of one of the world’s oldest philosophies. For more than three centuries, Ladnun has be…