McAdams Peak in Quarry Township, Illinois

When you approach the top of McAdams Peak, the woods part, the wind picks up, and the landscape falls away. From this singular viewpoint along a looping 1.8-mile trail, visitors can take in the Illinois River, several nearby lakes, and the nearby junction of the Mississippi River. On a clear day, visitors can see 30 miles to the St. Louis skyline, a sweeping panorama that feels far removed from the Prairie State’s reputation. This portion of the park is part of a 300-acre nature preserve dedicated to this distinctive ecosystem. Hill prairies are among the rarest natural habitats in Illinois...