This is one of the best arboretums in the country, and makes for a great stroll. Begun in 1887 and bequeathed to the University of Pennsylvania in 1932, this 92-acre arboretum was based on Victorian-era garden and landscape design, with its romantic winding paths, hidden grotto, a fernery, a koi pond, and natural woodland. The highlights are the spectacular rose garden and the swans. Large modern sculptures, some of which are spectacular, are sprinkled throughout the property.
The arboretum has 3,500 trees and shrubs from around the world, including one of the finest collections of Asian plants outside Asia. Twice annually, the popular Garden Railway exhibit features an elaborate model railroad surrounded by miniature replicas of historic Philadelphia landmarks and other notable buildings crafted from natural materials. You may want to drive, as it's a good hike from the top of Chestnut Hill and a very hilly but short bike ride.
100 E. Northwestern Ave., Philadelphia, Pennsylvania, 19118, United States