John Heinz National Wildlife Refuge at Tinicum (PA)
Celebrated as America's First Urban Refuge, John Heinz National Wildlife Refuge at Tinicum is home to the largest remaining freshwater tidal marsh in Pennsylvania, known as Tinicum Marsh. Established in 1972, the refuge is part of the U.S. Fish and Wildlife Service's National Wildlife Refuge System, a network of lands set aside for the benefit of native wildlife and plants. Visitors to the refuge may observe hundreds of species of plants, trees, birds, insects, and mammals. There is a sizable, modern visitor center at the park entrance.