Indiana Dunes National Park

Listen first. Under your feet, the sand may squeak, a dry, high chirp with every step. Locals call it singing sand. The sound comes from clean, rounded quartz grains rubbing against each other when the sand is dry. Above it, the wind comes off Lake Michigan and pushes through marram grass on the ridges. Out on the water, the light changes almost by the minute, from steel grey to a green that looks closer to the Caribbean than the Midwest.

You are standing on the southern shore of Lake Michigan, in the northwest corner of Indiana. This park runs along the lakefront across parts of Porter County and its neighbours, Lake County and LaPorte County. It is a long, narrow ribbon of land. Beach, dune, wetland, prairie and forest all sit within a short walk of each other. That compression is the whole point of the place. Few landscapes pack so many different worlds into such a small space.

The dunes themselves are young by geological standards. As the great glaciers of the last ice age melted back, they left the lake much larger than it is today. Over thousands of years, the water level dropped in stages. Each old shoreline left behind a ridge of sand. Wind did the rest, lifting sand off the beach and piling it inland. So when you walk south from the water, you are walking backward through time, from the newest dunes to the oldest.

That simple pattern made this shoreline famous in science. Around the end of the nineteenth century, a University of Chicago botanist named Henry Chandler Cowles came here to study plants. He noticed that the bare sand near the water held only a few tough grasses. Further inland, he found shrubs, then pines, then oak forest. He argued that he was seeing one process — plant communities replacing each other over time. This idea, called ecological succession, became a foundation of modern ecology. Many scientists call these dunes one of the birthplaces of the field.

Here is the first surprise. Because so many habitats meet here, the park holds an unusual mix of life. Arctic plants left over from the ice age can grow near desert-like prickly pear cactus. Northern bog plants live a short distance from southern forest species. The National Park Service often notes that this is one of the most biologically diverse places in the national park system, especially for its size. Bird watchers come in spring and autumn, when migrating birds follow the lakeshore as they travel.

Now look along the coast, and you may see something that seems out of place — smokestacks. Steel mills and industrial plants stand right beside the protected shoreline. This is not an accident. In the early twentieth century, industry and conservation fought over this same sand. Factories wanted the flat lakefront land, and companies dug some dunes away for their sand. At the same time, a group of Chicago scientists, artists and citizens began a long campaign to save what remained.

That fight lasted for decades. A small state park was created first, in the 1920s, and it still exists today inside the national park's boundaries. In 1966, Congress established the Indiana Dunes National Lakeshore. Then, in 2019, it was renamed and became a full national park. So the landscape you see is a patchwork. It is protected land stitched together around towns, railways, a harbour and heavy industry. That patchwork is the story of the place.

The second surprise is that some of these dunes move. The best-known example is Mount Baldy, a large dune near Michigan City. Wind pushes its sand slowly inland, year after year, and it has buried trees in its path. As those trees rot away inside the dune, they can leave hollow spaces. In 2013, a young boy fell into one such hole and was trapped under the sand for hours before rescuers reached him. He survived. Since then, much of the dune has been closed to free climbing, and visits often happen on guided walks.

The dunes also gathered human stories. Legend has it that in the early twentieth century, a woman lived alone among these hills, swimming in the lake and walking the beaches far from city life. Newspapers called her Diana of the Dunes. Many details of her life are uncertain, and the tale grew in the retelling. Still, locals say her story helped turn the dunes into a symbol of freedom for people escaping the crowded industrial cities nearby.

Other history here is easier to see. In the town of Beverly Shores, a row of unusual houses stands along Lake Front Drive. Several of them were built as model homes for the Century of Progress world's fair in Chicago in 1933. After the fair, they were moved here by barge and truck. They show bold ideas of their time, including glass walls and new building materials. Inland, the Bailly Homestead and the Chellberg Farm show earlier chapters, from fur trading days to Swedish immigrant farming.

Away from the beach, the land changes fast. The trails through Cowles Bog, named for the botanist, lead through wetland, forest and dune to the shore. The Great Marsh, one of the largest wetland areas in the park, fills with the calls of frogs in spring. In late summer, prairie areas glow with tall grasses and wildflowers. In winter, the lake can freeze into ridges of ice along the shore. The same trail can feel like four different places across the year.

On a clear day, look northwest across the water. You may see the skyline of Chicago, small and pale on the horizon. That view explains a great deal. This shoreline has always been close to a big city. The South Shore Line commuter train still runs nearby, and for generations it brought city families here for a day at the beach. The dunes were never truly remote. They survived because enough people decided they were worth keeping.

Before you leave, stand still for a moment. Feel how the sand shifts and settles under your shoes. Watch the grasses bend in the wind, and notice how their roots hold the slope together. Listen for gulls, and for waves breaking on the shore. Everything around you is in slow motion — sand moving inland, forest following behind it, the lake reshaping the beach. As you walk back, look at the plants on each ridge, and see the story Cowles saw.