Indiana Dunes, Where Science Learned to Read a Landscape

Henry Cowles was a thirty-year-old graduate student at the University of Chicago in eighteen ninety-nine when he published a paper in the Botanical Gazette that would become one of the foundational documents of modern ecology. He had been working in the Indiana Dunes, the arc of sand ridges and wetlands along the southern shore of Lake Michigan that the glacier had left behind when it retreated ten thousand years ago. What Cowles had noticed was that the dunes formed a living laboratory: each zone from the active beach inward to the older, more stable ground represented a different stage in the same process of plant succession, from bare sand to marram grass to cottonwood to oak forest. By reading the dunes in space, he could reconstruct how a landscape changed through time.

The concept of ecological succession, which Cowles developed from his dunes work, became foundational to how ecologists understand every landscape: the idea that plant communities are not static but are always in transition toward climax states, and that disturbance, whether by fire, flood, or human action, resets the process. It is among the most basic ideas in environmental science, and it came from a young botanist crawling around these specific ridges of sand in northern Indiana.

The dunes were simultaneously coveted by United States Steel for industrial expansion. A fifty-year conservation fight, led by landscape architect Jens Jensen in the early decades and then by a housewife named Dorothy Buell, who founded the Save the Dunes Council in nineteen fifty-two, eventually produced the Indiana Dunes National Lakeshore in nineteen sixty-six and the full National Park designation in twenty nineteen.

The Beverly Shores section of the park contains five houses that were transported by barge from the Century of Progress World's Fair in Chicago in nineteen thirty-three and thirty-four, and are still standing: a small catalog of Depression-era modernism preserved by accident inside a national park, because someone decided to float them across the lake rather than demolish them.