Three generations later, not only his great-grandchildren but pilgrims from around the world seek out this “refuge from too much modernity.” Across the marsh, an interstate highway hums with car and truck traffic, yet the reconstructed prairie and planted forest vie for attention, and soon the hum fades away. Big bluestem grass stands six feet high in the summer, rebuilding the soil along with dozens of other species of grasses and wildflowers. In groves of Leopold pines, branches weave together high overhead.