 The preserve was designated a National Natural Landmark in 1965.The Glen features more than twenty miles of publicly accessible trails and includes 2.5 miles of the National Scenic Little Miami River, regionally significant stands of old-growth forest, a distinct rock column known as Pompey's Pillar, ecologically reclaimed farm land, the Orators Mound (a Hopewell burial mound), and the Yellow Spring, for which the town is named.The preserve is a learning laboratory for Antioch College, supporting academic offerings as well as faculty and student research, and also offers a wide variety of public programs and outreach to the wider Miami Valley region.