Originally formed in 1908, as an outgrowth of the Playground Association of Chicago, the Prairie Club was incorporated as a separate entity in 1911. Embodying the typical reform mentality of the Progressive era, the club emphasized outdoor recreation and preservation, and sponsored walking trips around Chicago's countryside. Captured here in over 200 vintage photographs are the footsteps of the Prairie Club as they built a constituency for exploring and preserving the forests and fields surrounding the Windy City.

Like many large American cities in the early 1900s, Chicago's...