SCA, U.S. Fish and Wildlife, Philadelphia Communities and surrounding organizations working together. Developing "Urban Gardens" in and around Downtown Philadelphia. Focusing on youth development and the importance of "green space" in Historic Philadelphia. John Heinz National Wildlife Refuge at Tinicum is our hub(America's First Urban Refuge was established in 1972 for the purpose of preserving, restoring, and developing the natural area known as Tinicum Marsh and promoting environmental education).