The 1700-acre outdoor "tree museum" founded in 1922 by a Morton Salt tycoon has 3800 kinds of trees and shrubs from 63 countries and 176,000 specimens, a four-acre children's garden where kids learn about nature through play, 14 miles of trails and nine miles of paved roads. The Arboretum also offers hundreds of adult and kids classes during the year. The space was founded by Joy Morton of the Morton Salt Company, who initially purchased the land in 1908 for his personal estate.