Minnetrista Cultural Center, just north of downtown along the White River, is a cultural heritage museum featuring exhibits and programs focusing on nature, east-central Indiana history, and art. The campus includes historic homes that were once owned by the Ball family, themed gardens, outdoor sculptures, and a portion of the White River Greenway. The Cardinal Greenway, Indiana's longest rail trail project, stretches from Richmond to Marion, Indiana. Designated a National Recreation Trail in 2003, it is part of the American Discovery Trail. The Ball State campus is home to Christy Woods, an arboretum, three greenhouses, and the Wheeler Orchid Collection and Species Bank.